pqm

{ "$schema": "./schema.json", "prefixes": { "y": { "scale": "1e-24", "name": "yocto" }, "z": { "scale": "1e-21", "name": "zepto" }, "a": { "scale": "1e-18", "name": "atto" }, "f": { "scale": "1e-15", "name": "femto" }, "p": { "scale": "1e-12", "name": "pico" }, "n": { "scale": "1e-9", "name": "nano" }, "u": { "scale": "1e-6", "name": "micro" }, "m": { "scale": "1e-3", "name": "milli" }, "c": { "scale": "1e-2", "name": "centi" }, "d": { "scale": "1e-1", "name": "deci" }, "da": { "scale": "1e1", "name": "deca" }, "h": { "scale": "1e2", "name": "hecto" }, "k": { "scale": "1e3", "name": "kilo" }, "M": { "scale": "1e6", "name": "mega" }, "G": { "scale": "1e9", "name": "giga" }, "T": { "scale": "1e12", "name": "tera" }, "P": { "scale": "1e15", "name": "peta" }, "E": { "scale": "1e18", "name": "exa" }, "Z": { "scale": "1e21", "name": "zetta" }, "Y": { "scale": "1e24", "name": "yotta" }, "Ki": { "scale": "2^10", "name": "kibi" }, "Mi": { "scale": "2^20", "name": "mebi" }, "Gi": { "scale": "2^30", "name": "gibi" }, "Ti": { "scale": "2^40", "name": "tebi" }, "Pi": { "scale": "2^50", "name": "pebi" }, "Ei": { "scale": "2^60", "name": "exbi" }, "Zi": { "scale": "2^70", "name": "zebi" }, "Yi": { "scale": "2^80", "name": "yobi" } }, "units": { "1": { "name": "One", "description": "Unit non-dimensional quantity", "category": "unitless", "scale": "1", "dimensions": {} }, "%": { "name": "Percent", "description": "Non dimensional percent (100 % == 1)", "category": "unitless", "scale": "1e-2", "dimensions": {} }, "ppm": { "name": "Parts per Million", "description": "Unitless quantity defined as 1 / 10^6", "category": "unitless", "scale": "1e-6", "dimensions": {} }, "ppb": { "name": "Parts per Billion", "description": "Unitless quantity defined as 1 / 10^9", "category": "unitless", "scale": "1e-9", "dimensions": {} }, "ppt": { "name": "Parts per Trillion", "description": "Unitless quantity defined as 1 / 10^12", "category": "unitless", "scale": "1e-12", "dimensions": {} }, "g": { "name": "Gram", "description": "unit of mass defined as 1e-3 kg", "category": "mass", "scale": "1e-3", "dimensions": {"mass": 1} }, "Da" : { "name": "Dalton", "description": "Sometimes called an atomic mass unit, defined as 1/12 of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state and at rest", "category": "mass", "scale": "1.66053906660e-27", "dimensions": {"mass": 1}, "aliases": ["u", "AMU"] }, "grain": { "name": "Grain", "description": "Mass approximately equivalent to a single ideal seed of a cereal, in particular wheat or barley", "category": "mass", "scale": "6.479891e-5", "dimensions": {"mass": 1} }, "ozm": { "name": "Ounce", "description": "US and Imperial unit equal to 1/16 of a Pound Mass", "category": "mass", "scale": "2.8349523125e-2", "dimensions": {"mass": 1} }, "dram": { "name": "Dram", "description": "Unit of mass historically used by apothecaries equal to 1/16 of an ounce", "category": "mass", "scale": "1.7718451953125e-3", "dimensions": {"mass": 1} }, "lbm": { "name": "Pound", "description": "US and Imperial primary unit of mass", "category": "mass", "scale": "4.5359237e-1", "dimensions": {"mass": 1} }, "stone": { "name": "Stone", "description": "Imperial unit equal to 14 Pounds Mass", "category": "mass", "scale": "6.35029318", "dimensions": {"mass": 1} }, "sg": { "name": "Slug", "description": "US and Imperial unit defined as 1 lbf / Standard Gravity", "category": "mass", "scale": "1.45939029372064e1", "dimensions": {"mass": 1}, "aliases": ["slug"] }, "cwt": { "name": "Short Hundredweight", "description": "Typically used in the US, equal to 100 lbm", "category": "mass", "scale": "4.5359237e1", "dimensions": {"mass": 1} }, "dwt": { "name": "Short Pennyweight", "description": "From the weight of an English penny in the Middle Ages, equal to 24 grains or 1/20 of a troy ounce", "category": "mass", "scale": "1.55517384e-3", "dimensions": {"mass": 1} }, "uk_cwt": { "name": "Long Hundredweight", "description": "Typically used in the UK, equal to 8 stone", "category": "mass", "scale": "5.080234544e1", "dimensions": {"mass": 1} }, "ton": { "name": "Ton", "description": "US customary unit equal to 2000 lbm", "category": "mass", "scale": "9.0718474e2", "dimensions": {"mass": 1} }, "uk_ton": { "name": "UK Ton", "description": "English customary unit that is equal to 20 Long Hundredweight or 160 Stone", "category": "mass", "scale": "1.0160469088e3", "dimensions": {"mass": 1} }, "metric_ton": { "name": "Metric Ton", "description": "Sometimes seen as 'tonne', this mass equals 1000 kg", "category": "mass", "scale": "1e3", "dimensions": {"mass": 1}, "aliases": ["tonne"] }, "carat": { "name": "Carat", "description": "Equal to 200 mg, typically used to measure gemstones", "category": "mass", "scale": "2e-4", "dimensions": {"mass": 1} }, "assay_ton": { "name": "Assay Ton", "description": "Equal to 29 1/6 grams, often used to measure the ores of precious metals", "category": "mass", "scale": "2.9166666666666667e-2", "dimensions": {"mass": 1} }, "denier": { "name": "Denier", "description": "Linear density used in textiles, the linear density of a single strand of silk is approx. 1 denier", "category": "miscellaneous", "scale": "1.1111111111111112e-7", "dimensions": {"mass": 1, "length": -1} }, "tex": { "name": "Tex", "description": "Linear density equal to 1 g / km, mainly used for measuring fiber products", "category": "miscellaneous", "scale": "1e-6", "dimensions": {"mass": 1, "length": -1} }, "m": { "name": "Meter", "description": "SI standard unit for length", "category": "length", "scale": "1", "dimensions": {"length": 1} }, "ang": { "name": "Angstrom", "description": "Equal to 10^-10 meters, often used to express the size of atoms and molecules", "category": "length", "scale": "1e-10", "dimensions": {"length": 1} }, "picapt": { "name": "Pica Point", "description": "Used in typography, equal to 1/12 of a pica", "category": "length", "scale": "3.52777777777778e-4", "dimensions": {"length": 1} }, "pica": { "name": "Pica", "description": "Used in typography, equal to 1/6 of an inch", "category": "length", "scale": "4.23333333333333e-3", "dimensions": {"length": 1} }, "in": { "name": "Inch", "description": "US and Imperial unit of length equal to 1/12 of a foot", "category": "length", "scale": "2.54e-2", "dimensions": {"length": 1} }, "mil": { "name": "Mil", "description": "US and Imperial units for milli-inch, avoids a unit collision with the unit 'min'", "category": "length", "scale": "2.54e-5", "dimensions": {"length": 1} }, "ft": { "name": "Foot", "description": "Standard US and Imperial unit of length", "category": "length", "scale": "3.048e-1", "dimensions": {"length": 1} }, "yd": { "name": "Yard", "description": "US and Imperial unit of length equal to 3 foot", "category": "length", "scale": "9.144e-1", "dimensions": {"length": 1} }, "ell": { "name": "Ell", "description": "Formerly used in the english tayloring industry and defined as a yard and a quarter, now obsolete", "category": "length", "scale": "1.143", "dimensions": {"length": 1} }, "mi": { "name": "Mile", "description": "US and Imperial measure of distance equal to 5280 feet or 1,609.344 meters", "category": "length", "scale": "1.609344e3", "dimensions": {"length": 1} }, "survey_mi": { "name": "Survey Mile", "description": "US Customary unit equal to 5280 Survey Feet", "category": "length", "scale": "5280*(1200/3937)", "dimensions": {"length": 1} }, "nmi": { "name": "Nautical Mile", "description": "Approximately 1/60 of a degree of latitude, formally defined as 1852 meters", "category": "length", "scale": "1.852e3", "dimensions": {"length": 1}, "aliases": ["Nmi"] }, "league": { "name": "League", "description": "Originally represented the distance a person could walk in one day, the most recent common usage was in maritime where it is equal to 3 nautical miles", "category": "length", "scale": "5.556e3", "dimensions": {"length": 1} }, "ly": { "name": "Light Year", "description": "Represents the distance light travels in one year in a vacuum, used in astronomical scales", "category": "length", "scale": "9.4607304725808e15", "dimensions": {"length": 1} }, "parsec": { "name": "Parsec", "description": "Defined as 648 000 / pi astronomical units (au)", "category": "length", "scale": "3.08567758128155e16", "dimensions": {"length": 1} }, "survey_ft": { "name": "Survey Foot", "description": "Slightly different definition of foot defined as 1200/3937 meters instead of 0.3048 meters", "category": "length", "scale": "(1200/3937)", "dimensions": {"length": 1} }, "AU": { "name": "Astronomical Unit", "description": "Approximate distance from the Earth to the Sun", "category": "length", "scale": "1.495978707e11", "dimensions": {"length": 1} }, "chain": { "name": "Chain", "description": "US customary unit equal to 66 survey ft, sometimes the unit may be based on the internation foot rather than the survey foot changing the definition slightly", "category": "length", "scale": "66*(1200/3937)", "dimensions": {"length": 1} }, "link": { "name": "Link", "description": "US Customary unit of length equal to 1/100 of a chain", "category": "length", "scale": "(66/100)*(1200/3937)", "dimensions": {"length": 1} }, "rod": { "name": "Rod", "description": "US Customary unit of length equal to 1/4 of a chain", "category": "length", "scale": "(66/4)*(1200/3937)", "dimensions": {"length": 1} }, "furlong": { "name": "Furlong", "description": "US Customary unit of length equal to 10 chains", "category": "length", "scale": "660*(1200/3937)", "dimensions": {"length": 1} }, "fathom": { "name": "Fathom", "description": "Equal to 6 international foot, typically used to measure depth in maritime applications", "category": "length", "scale": "1.8288", "dimensions": {"length": 1} }, "us_fathom": { "name": "US Fathom", "description": "US Customary Fathom, appox. equal to 6 survey foot", "category": "length", "scale": "6*(1200/3937)", "dimensions": {"length": 1} }, "fermi": { "name": "Fermi", "description": "Equal to 10^-15 m, Used in nuclear physics and named after physicist Enrico Fermi who was one of the founders of the field", "category": "length", "scale": "1e-15", "dimensions": {"length": 1} }, "datamile": { "name": "Data Mile", "description": "A distance used in radar measurements equal to 6000 international feet", "category": "length", "scale": "1.8288e3", "dimensions": {"length": 1} }, "kayser": { "name": "Kayser/Wavenumber", "description": "Reciprocal of 1 cm, used in spectroscopy and chemistry to represent the number of wavelengths per cm", "category": "miscellaneous", "scale": "1e02", "dimensions": {"length": -1} }, "s": { "name": "Second", "description": "Approximately 1/86400 of a stellar day, formally defined based on the duration of 9 192 631 770 state transitions of the caesium-133 atom at 0 K", "category": "time", "scale": "1", "dimensions": {"time": 1}, "aliases": ["sec"] }, "min": { "name": "Minute", "description": "Defined as 60 seconds", "category": "time", "scale": "6e1", "dimensions": {"time": 1} }, "hr": { "name": "Hour", "description": "Defined as 60 minute", "category": "time", "scale": "3.6e3", "dimensions": {"time": 1} }, "day": { "name": "Day", "description": "Approximately equal to the amount of time for the earth to rotate on it's axis, formally defined as 24 hours", "category": "time", "scale": "8.64e4", "dimensions": {"time": 1} }, "week": { "name": "Week", "description": "Defined as 7 days", "category": "time", "scale": "6.048e5", "dimensions": {"time": 1} }, "fortnight": { "name": "Fortnight", "description": "Amount of time defined as 2 weeks or 14 days", "category": "time", "scale": "1.2096e6", "dimensions": {"time": 1} }, "yr": { "name": "Year", "description": "Approximately equal to the amount of time for the earth to make one orbit around the sun, formally defined as 365 days", "category": "time", "scale": "3.1536e7", "dimensions": {"time": 1} }, "shake": { "name": "Shake", "description": "Informal metric unit equal to 10^-8 seconds, often used in nuclear physics", "category": "time", "scale": "1e-8", "dimensions": {"time": 1} }, "K": { "name": "Kelvin", "description": "SI standard unit with 0 defined as absolute zero", "category": "temperature", "scale": "1", "dimensions": {"temperature": 1}, "aliases": ["deltaC"] }, "degF": { "name": "Degrees Fahrenheit", "description": "Temperature scale that is approximately 32 at the melting point of ice and 212 at the boiling point of water", "category": "temperature", "scale": "(5/9)", "dimensions": {"temperature": 1}, "offset": "273.15-(32*5/9)" }, "degC": { "name": "Degrees Celsius", "description": "Temperature unit with a similar scale to Kelvin, but with the 0 approximately defined as the melting point of ice", "category": "temperature", "scale": "1", "dimensions": {"temperature": 1}, "offset": "2.7315e2" }, "Ra": { "name": "Rankine", "description": "Units with the same scale as Fahrenheit, but with 0 at absolute 0", "category": "temperature", "scale": "(5/9)", "dimensions": {"temperature": 1}, "aliases": ["Rank", "deltaF"] }, "Reau": { "name": "Reaumur", "description": "Temperature scale that is approximately 0 at the melting point of ice and 80 at the boiling point of water", "category": "temperature", "scale": "1.25", "dimensions": {"temperature": 1}, "offset": "2.7315e2" }, "deltaReau": { "name": "Delta Reaumur", "description": "Change in temperature as measured in Reaumurs", "category": "temperature", "scale": "1.25", "dimensions": {"temperature": 1} }, "kph": { "name": "Kilometer per Hour", "description": "Velocity at which a kilometer is traveled every hour", "category": "velocity", "scale": "1000/3600", "dimensions": {"length": 1, "time": -1} }, "mph": { "name": "Mile per Hour", "description": "Velocity at which a mile is traveled every hour", "category": "velocity", "scale": "4.4704e-1", "dimensions": {"length": 1, "time": -1} }, "fps": { "name": "Feet per Second", "description": "Velocity where 1 foot is traveled every second", "category": "velocity", "scale": "3.048e-1", "dimensions": {"length": 1, "time": -1} }, "knot": { "name": "Knot", "description": "Velocity at which a Nautical mile is traveled every hour ", "category": "velocity", "scale": "5.14444444444444e-1", "dimensions": {"length": 1, "time": -1} }, "admkn": { "name": "Admirality Knot", "description": "Knot based on the old UK definition of a Nautical mile (1853.184 m)", "category": "velocity", "scale": "5.14773333333333e-1", "dimensions": {"length": 1, "time": -1} }, "c": { "name": "Speed of Light", "description": "velocity defined by how fast light travels in a vacuum", "category": "velocity", "scale": "2.99792458e8", "dimensions": {"length": 1, "time": -1} }, "grav": { "name": "Standard Gravity", "description": "Approximate acceleration of gravity at the surface of the earth", "category": "acceleration", "scale": "9.80665", "dimensions": {"length": 1, "time": -2} }, "galileo": { "name": "Galileo", "description": "CGS system standard unit for acceleration", "category": "acceleration", "scale": "1e-2", "dimensions": {"length": 1, "time": -2} }, "Pa": { "name": "Pascal", "description": "SI standard unit for pressure defined as 1 N/m^2", "category": "pressure", "scale": "1", "dimensions": {"mass": 1, "length": -1, "time": -2} }, "mHg": { "name": "Meter of Mercury", "description": "The pressure applied by 1 m of mercury at 1 standard gravity, more commonly used as mmHg or cmHg", "category": "pressure", "scale": "1.3332239e5", "dimensions": {"mass": 1, "length": -1, "time": -2} }, "mH2O": { "name": "Meter of Water", "description": "The pressure applied by 1 m of water at 1 standard gravity, more commonly used as mmH2O or cmH2O", "category": "pressure", "scale": "9.80665e3", "dimensions": {"mass": 1, "length": -1, "time": -2} }, "Torr": { "name": "Torr", "description": "Slightly different definition of mmHg, but very close to the same scale", "category": "pressure", "scale": "1.33322368421053e2", "dimensions": {"mass": 1, "length": -1, "time": -2} }, "psi": { "name": "Pound per Square Inch", "description": "US and Imperial unit of pressure defined as 1 lbf / in^2", "category": "pressure", "scale": "6.89475729316836e3", "dimensions": {"mass": 1, "length": -1, "time": -2} }, "atm": { "name": "Atmosphere", "description": "Approximately the mean air pressure at sea level", "category": "pressure", "scale": "1.01325e5", "dimensions": {"mass": 1, "length": -1, "time": -2} }, "bar": { "name": "Bar", "description": "Defined as 100 000 Pa, which is very close to 1 atmosphere", "category": "pressure", "scale": "1e5", "dimensions": {"mass": 1, "length": -1, "time": -2} }, "inHg": { "name": "Inch of Mercury", "description": "The pressure applied by 1 inch of mercury at 1 standard gravity", "category": "pressure", "scale": "3.3863886666667e3", "dimensions": {"mass": 1, "length": -1, "time": -2} }, "inH2O": { "name": "Inch of Water", "description": "The pressure applied by 1 inch of water at 1 standard gravity", "category": "pressure", "scale": "2.4908891e2", "dimensions": {"mass": 1, "length": -1, "time": -2} }, "ftHg": { "name": "Foot of Mercury", "description": "The pressure applied by 1 foot of mercury at 1 standard gravity", "category": "pressure", "scale": "4.0636664e4", "dimensions": {"mass": 1, "length": -1, "time": -2} }, "ftH2O": { "name": "Foot of Water", "description": "The pressure applied by 1 foot of water at 1 standard gravity", "category": "pressure", "scale": "2.98906692e3", "dimensions": {"mass": 1, "length": -1, "time": -2} }, "Ba": { "name": "Barye", "description": "CGS standard unit for pressure", "category": "pressure", "scale": "1e-1", "dimensions": {"mass": 1, "length": -1, "time": -2} }, "Pa-g": { "name": "Gauge Pascal", "description": "Pascal with a zero offset at atmospheric pressure", "category": "pressure", "scale": "1", "dimensions": {"mass": 1, "length": -1, "time": -2}, "offset": "1.01325e5" }, "bar-g": { "name": "Gauge Bar", "description": "Bar with a zero offset at atmospheric pressure", "category": "pressure", "scale": "1e5", "dimensions": {"mass": 1, "length": -1, "time": -2}, "offset": "1.01325e5" }, "psi-g": { "name": "Gauge PSI", "description": "psi with a zero offset at atmospheric pressure", "category": "pressure", "scale": "6.89475729316836e3", "dimensions": {"mass": 1, "length": -1, "time": -2}, "offset": "1.01325e5" }, "N": { "name": "Newton", "description": "SI standard unit for force defined as 1 kg m / s^2", "category": "force", "scale": "1", "dimensions": {"mass": 1, "length": 1, "time": -2} }, "dyn": { "name": "Dyne", "description": "CGS standard unit for force defined as 1 g [c]m / s^2", "category": "force", "scale": "1e-5", "dimensions": {"mass": 1, "length": 1, "time": -2} }, "gf": { "name": "Gram Force", "description": "Defined as the amount of force exerted by standard gravity on a 1 gram mass", "category": "force", "scale": "9.80665e-3", "dimensions": {"mass": 1, "length": 1, "time": -2}, "aliases": ["pond"] }, "lbf": { "name": "Pound Force", "description": "Defined as the amount of force exerted by standard gravity on a 1 lbm mass", "category": "force", "scale": "4.4482216152605", "dimensions": {"mass": 1, "length": 1, "time": -2} }, "ozf": { "name": "Ounce Force", "description": "Equal to 1/16 lbf", "category": "force", "scale": "2.78013850953781e-1", "dimensions": {"mass": 1, "length": 1, "time": -2} }, "pdl": { "name": "Poundal", "description": "Force unit in the foot-pound-second system equal to 1 lbm ft / s^2", "category": "force", "scale": "1.38254954376e-1", "dimensions": {"mass": 1, "length": 1, "time": -2} }, "ton-force": { "name": "Ton Force", "description": "Equal to 2000 lbf", "category": "force", "scale": "8.896443230521e3", "dimensions": {"mass": 1, "length": 1, "time": -2} }, "J": { "name": "Joule", "description": "SI standard unit for energy defined as 1 N m", "category": "energy", "scale": "1", "dimensions": {"mass": 1, "length": 2, "time": -2} }, "eV": { "name": "Electron Volt", "description": "Energy gain of an electron after passing through a 1 Volt potential", "category": "energy", "scale": "1.602176487e-19", "dimensions": {"mass": 1, "length": 2, "time": -2} }, "erg": { "name": "Erg", "description": "CGS standard unit of energy defined as 1 dyn cm ", "category": "energy", "scale": "1e-7", "dimensions": {"mass": 1, "length": 2, "time": -2} }, "cal": { "name": "Calorie", "description": "Based on the amount of energy needed to raise the temperature of 1 kg of water 1 degree Celsius, defined in The Fifth International Conference on the Properties of Steam (London, July 1956) 'International Table'", "category": "energy", "scale": "4.1868", "dimensions": {"mass": 1, "length": 2, "time": -2} }, "Cal": { "name": "Kilo-calorie", "description": "Commonly used to measure the energy in food in the US, equal to 1000 calories and often refered to as a 'calorie' rather than a kilo-calorie", "category": "energy", "scale": "4.1868e3", "dimensions": {"mass": 1, "length": 2, "time": -2} }, "BTU": { "name": "British Thermal Unit", "description": "Based on the amount of energy needed to raise the temperature of 1 lbm of water 1 degree Fahrenheit, defined in The Fifth International Conference on the Properties of Steam (London, July 1956) 'International Table'", "category": "energy", "scale": "1.05505585e3", "dimensions": {"mass": 1, "length": 2, "time": -2} }, "thm": { "name": "Therm", "description": "Unit of energy equal to 100 000 BTU, approximately the energy equivalent of burning 100 ft^3 of natural gas", "category": "energy", "scale": "1.05505585e8", "dimensions": {"mass": 1, "length": 2, "time": -2} }, "Wh": { "name": "Watt-hour", "description": "Amount of energy dissipated by 1 Watt source over an hour", "category": "energy", "scale": "3.6e3", "dimensions": {"mass": 1, "length": 2, "time": -2} }, "HPh": { "name": "Horse Power Hour", "description": "Amount of energy dissipated by a 1 HP source over an hour", "category": "energy", "scale": "2.68451953769617e6", "dimensions": {"mass": 1, "length": 2, "time": -2} }, "ft-lb": { "name": "Foot Pound-force", "description": "Defined as 1 ft x 1 lbf, typically used to describe torques rather than energy", "category": "energy", "scale": "1.3558179483314", "dimensions": {"mass": 1, "length": 2, "time": -2}, "aliases": ["ft-lbf"] }, "RSI": { "name": "R Value (SI)", "description": "Thermal insulation defined as 1 K m^2 / W", "category": "insulation", "scale": "1", "dimensions": {"mass": -1, "time": 3, "temperature": 1} }, "RIP": { "name": "R Value (Foot Pound)", "description": "Thermal insulation defined as 1 Ra ft^2 hr / BTU", "category": "insulation", "scale": "1.7611018368230189e-1", "dimensions": {"mass": -1, "time": 3, "temperature": 1} }, "clo": { "name": "Clothing", "description": "Thermal insulation unit used in clothing design, defined as the amount of insulation that allows a person at rest to maintain thermal equilibrium in an 21 degC, normally ventilated room", "category": "insulation", "scale": "1.55e-1", "dimensions": {"mass": -1, "time": 3, "temperature": 1} }, "tog": { "name": "Tog", "description": "Thermal insulation unit defined as exactly 0.1 K m^2 / W", "category": "insulation", "scale": "1e-1", "dimensions": {"mass": -1, "time": 3, "temperature": 1} }, "W": { "name": "Watt", "description": "SI standard unit for energy, defined as 1 J / s", "category": "power", "scale": "1", "dimensions": {"mass": 1, "length": 2, "time": -3} }, "PS": { "name": "Metric Horsepower", "description": "Defined as the amount of power to raise a mass of 75 kg against standard gravity over a distance of 1 meter in one second", "category": "power", "scale": "7.3549875e2", "dimensions": {"mass": 1, "length": 2, "time": -3} }, "HP": { "name": "Mechanical Horsepower", "description": "Defined as 33 000 ft lbf / min", "category": "power", "scale": "7.4569987158227e2", "dimensions": {"mass": 1, "length": 2, "time": -3} }, "P": { "name": "Poise", "description": "CGS unit for dynamic viscosity", "category": "miscellaneous", "scale": "1e-1", "dimensions": {"mass": 1, "length": -1, "time": -1} }, "rhe": { "name": "Rhe", "description": "CGS unit for fluidity, equal to exactly 1 P^-1", "category": "miscellaneous", "scale": "1e1", "dimensions": {"mass": -1, "length": 1, "time": 1} }, "St": { "name": "Stokes", "description": "CGS unit for kinematic viscosity", "category": "miscellaneous", "scale": "1e-4", "dimensions": {"length": 2, "time": -1} }, "L": { "name": "Liter", "description": "Volume defined as 1 [d]m^3 or 10^-3 m^3", "category": "volume", "scale": "1e-3", "dimensions": {"length": 3} }, "tsp": { "name": "Teaspoon", "description": "US Customary volume unit that is close to 5 mL", "category": "volume", "scale": "4.92892159375e-6", "dimensions": {"length": 3} }, "tspm": { "name": "Metric Teaspoon", "description": "Based on the US Teaspoon, but defined as exactly 5 mL", "category": "volume", "scale": "5e-6", "dimensions": {"length": 3} }, "tbs": { "name": "Tablespoon", "description": "US Customary volume unit that is defined as 3 tsp", "category": "volume", "scale": "1.478676478125e-5", "dimensions": {"length": 3} }, "fl_oz": { "name": "Fluid Ounce", "description": "US Customary volume unit that is defined as 2 tbs", "category": "volume", "scale": "2.95735295625e-5", "dimensions": {"length": 3} }, "uk_fl_oz": { "name": "UK Fluid Ounce", "description": "Imperial unit approximately equal to the volume of 1 avoirdupois ounce of water", "category": "volume", "scale": "2.84130625e-5", "dimensions": {"length": 3} }, "cup": { "name": "Cup", "description": "US Customary volume unit that is defined as 8 fluid ounces", "category": "volume", "scale": "2.365882365e-4", "dimensions": {"length": 3} }, "pt": { "name": "Pint", "description": "US Customary volume unit that is defined as 2 cups", "category": "volume", "scale": "4.73176473e-4", "dimensions": {"length": 3} }, "uk_pt": { "name": "UK Pint", "description": "Imperial volume unit defined as 20 imperial ounces", "category": "volume", "scale": "5.6826125e-4", "dimensions": {"length": 3} }, "qt": { "name": "Quart", "description": "US Customary volume unit that is defined as 2 pints", "category": "volume", "scale": "9.46352946e-4", "dimensions": {"length": 3} }, "uk_qt": { "name": "UK Quart", "description": "Imperial volume unit defined as 2 UK pints", "category": "volume", "scale": "1.1365225e-3", "dimensions": {"length": 3} }, "gal": { "name": "Gallon", "description": "US Customary volume unit that is defined as 4 quarts", "category": "volume", "scale": "3.785411784e-3", "dimensions": {"length": 3} }, "uk_gal": { "name": "UK Gallon", "description": "Imperial volume unit defined as 4 UK quarts", "category": "volume", "scale": "4.54609e-3", "dimensions": {"length": 3} }, "bushel": { "name": "Bushel", "description": "Very old unit of volume that is associated with agricultural production, about 2150.42 in^3", "category": "volume", "scale": "3.523907016688e-2", "dimensions": {"length": 3} }, "bbl": { "name": "Oil Barrel", "description": "Defined internationally as 42 US Gallons, typically used in the oil industry", "category": "volume", "scale": "1.58987294928e-1", "dimensions": {"length": 3}, "aliases": ["oilbarrel"] }, "beerbarrel": { "name": "US Beer Barrel", "description": "Volume associated with beer trade in the US, equal to 31 US Gallons", "category": "volume", "scale": "1.17347765304e-1", "dimensions": {"length": 3} }, "uk_beerbarrel": { "name": "Imperial Beer Barrel", "description": "Appoximate volume of a barrel used for transporting beer in the UK, equal to 36 imperial gallons", "category": "volume", "scale": "1.6365924e-1", "dimensions": {"length": 3} }, "MTON": { "name": "Measurement Ton", "description": "Commonly used in the freight industry, equal to 40 ft^3", "category": "volume", "scale": "1.13267386368", "dimensions": {"length": 3} }, "GRT": { "name": "Gross Register Tonnage", "description": "commonly used in the freight industry equal to 100 ft^3", "category": "volume", "scale": "2.8316846592", "dimensions": {"length": 3} }, "gill": { "name": "Gill", "description": "US Customary unit of volume equal to 4 US fluid ounces", "category": "volume", "scale": "1.1829411825e-4", "dimensions": {"length": 3} }, "uk_gill": { "name": "UK Gill", "description": "Imperial unit equal to 5 Imperial (UK) fluid ounces", "category": "volume", "scale": "1.420653125e-4", "dimensions": {"length": 3} }, "peck": { "name": "Peck", "description": "US Customary unit for non-fluid volume, defined as 2 dry gallons", "category": "volume", "scale": "8.80976754172e-3", "dimensions": {"length": 3} }, "dry_gal": { "name": "Dry Gallon", "description": "US Customary unit for non-fluid volume, defined as exactly 268.8025 cubic inches", "category": "volume", "scale": "4.40488377086e-3", "dimensions": {"length": 3} }, "dry_qt": { "name": "Dry Quart", "description": "US Customary unit for non-fluid volume, defined as 1/4 of a dry gallon", "category": "volume", "scale": "1.101220942715e-3", "dimensions": {"length": 3} }, "dry_pt": { "name": "Dry Pint", "description": "US Customary unit for non-fluid volume, defined as 1/8 of a dry gallon", "category": "volume", "scale": "5.506104713575e-4", "dimensions": {"length": 3} }, "stere": { "name": "Stere", "description": "Equal to exactly 1 m^3, typically used to measure large quantities of firewood", "category": "volume", "scale": "1", "dimensions": {"length": 3} }, "ar": { "name": "Are", "description": "Equal to 1/100 hectares or 100 m^2", "category": "area", "scale": "1e2", "dimensions": {"length": 2} }, "morgen": { "name": "Morgen", "description": "Traditionally the area able to be plowed in a single day by a single bladed plow and an ox or horse, it now is approximately equal to 1/4 of a hectare", "category": "area", "scale": "2.5e3", "dimensions": {"length": 2} }, "acre": { "name": "Acre", "description": "Traditionally defined as the amount of area that could be plowed in one day by a yoke of oxen, still in use in the US", "category": "area", "scale": "4.04687260987425e3", "dimensions": {"length": 2}, "aliases": ["us_acre"] }, "uk_acre": { "name": "UK Acre", "description": "Slightly different than the US Acre, used in the UK until 1995", "category": "area", "scale": "4.0468564224e3", "dimensions": {"length": 2} }, "ha": { "name": "Hectare", "description": "Internationally used metric unit for measurement of the area of land, equal to 1000 m^3", "category": "area", "scale": "1e4", "dimensions": {"length": 2} }, "barn": { "name": "Barn", "description": "Equal to 10^-28 m^2, originally used in nuclear physics for expressing the cross sectional area of nuclei and nuclear reactions", "category": "area", "scale": "1e-28", "dimensions": {"length": 2} }, "b": { "name": "Bit", "description": "Basic unit of information that can take one of 2 states (on/off, 0/1, high/low)", "category": "information", "scale": "1", "dimensions": {"information": 1}, "aliases": ["bit"] }, "B": { "name": "Byte", "description": "Equal to 8 bits of information, commonly used in modern computing architectures", "category": "information", "scale": "8", "dimensions": {"information": 1}, "aliases": ["byte"] }, "word": { "name": "Word", "description": "Equal to 16 bits or 2 bytes", "category": "information", "scale": "16", "dimensions": {"information": 1} }, "dword": { "name": "Double Word", "description": "Equal to 32 bits, 4 bytes or 2 words", "category": "information", "scale": "32", "dimensions": {"information": 1} }, "baud": { "name": "Baud Rate", "description": "Rate of data transmission equal to 1 bit / second", "category": "information", "scale": "1", "dimensions": {"information": 1, "time": -1} }, "A": { "name": "Ampere", "description": "SI standard unit for electric current, equal to 1 C/s", "category": "electricity and magnetism", "scale": "1", "dimensions": {"current": 1} }, "C": { "name": "Coulomb", "description": "SI standard unit for electric charge defined as the amount of charge of exactly 6.2415093e18 elementary charges", "category": "electricity and magnetism", "scale": "1", "dimensions": {"current": 1, "time": 1} }, "Ah": { "name": "Amp Hour", "description": "Charge collected from 1 Amp over 1 hour", "category": "electricity and magnetism", "scale": "3.6e3", "dimensions": {"current": 1, "time": 1} }, "e": { "name": "Elementary Charge", "description": "The electric charge carried by a single proton", "category": "electricity and magnetism", "scale": "1.602176634e-19", "dimensions": {"current": 1, "time": 1} }, "V": { "name": "Volt", "description": "Derived SI unit for electric potential, can be defined as J/C", "category": "electricity and magnetism", "scale": "1", "dimensions": {"mass": 1, "length": 2, "current": -1, "time": -3} }, "ohm": { "name": "Ohm", "description": "Derived SI unit for electrical resistance", "category": "electricity and magnetism", "scale": "1", "dimensions": {"mass": 1, "length": 2, "current": -2, "time": -3} }, "F": { "name": "Farad", "description": "Derived SI unit of electrical capacitance", "category": "electricity and magnetism", "scale": "1", "dimensions": {"time": 4, "current": 2, "length": -2, "mass": -1} }, "H": { "name": "Henry", "description": "Derived SI unit for inductance", "category": "electricity and magnetism", "scale": "1", "dimensions": {"length": 2, "mass": 1, "time": -2, "current": -2} }, "S": { "name": "Siemens", "description": "Derived SI unit for electrical conductance, equal to 1 / ohm", "category": "electricity and magnetism", "scale": "1", "dimensions": {"time": 3, "current": 2, "length": -2, "mass": -1}, "aliases": ["mho"] }, "Wb": { "name": "Weber", "description": "SI unit for magnetic flux defined as 1 kg m^2 / (s^2 A)", "category": "electricity and magnetism", "scale": "1", "dimensions": {"mass": 1, "length":2, "time": -2, "current": -1} }, "Mx": { "name": "Maxwell", "description": "CGS unit for magnetic flux defined as 1 g cm^2 / (s^2 A)", "category": "electricity and magnetism", "scale": "1e-8", "dimensions": {"mass": 1, "length": 2, "time": -2, "current": -1} }, "T": { "name": "Tesla", "description": "SI unit for magnetic flux density defined as 1 Wb / m^2", "category": "electricity and magnetism", "scale": "1", "dimensions": {"mass": 1, "current": -1, "time": -2} }, "Gs": { "name": "Gauss", "description": "CGS unit for magnetic flux density defined as 1 Mx / cm^2", "category": "electricity and magnetism", "scale": "1e-4", "dimensions": {"mass": 1, "current": -1, "time": -2}, "aliases": ["gs"] }, "Fr": { "name": "Franklin", "description": "Standard unit of electrical charge in the EMU-CGS units of measure", "category": "electricity and magnetism", "scale": "3.3356409519815207e-10", "dimensions": {"current": 1, "time": 1} }, "Gi": { "name": "Gilbert", "description": "Obsolete unit used in EMU-CGS systems to me