dimensionless a designation asserting the absence of an associated unit second SI unit of time meter SI unit of length kilogram SI unit of mass kelvin SI unit of temperature coulomb SI unit of charge ampere SI unit of electrical current mole SI unit of substance amount candela SI base unit of luminous intensity (luminous power per unti solid angle emitted by a point light source in a particular direction) number a quantity or amount nominalMinute one minute of time excluding leap seconds, 60 seconds nominalHour one hour excluding leap seconds, 3600 seconds nominalDay one day excluding leap seconds, 86400 seconds nominalWeek one day excluding leap seconds, 604800 seconds nominalYear one year excluding leap seconds and leap days, 31536000 seconds nominalLeapYear one 366 day year excluding leap seconds, 31622400 seconds nanogram 0.000000000001 kg microgram 0.000000001 kg milligram 0.000001 kg centigram 0.00001 kg decigram 0.0001 kg gram 0.001 kg dekagram .01 kg hectogram .1 kg megagram 1000 kg tonne unit of mass equal to 1,000 kilograms, equivalent to approximately 2,204.6 pounds,1.102 short tons (US) or 0.984 long tons (imperial). Not part of the SI, but accepted for use with SI units and prefixes pound 1 pound (symbol lb) in the Avoirdupois (commerce) scale, and defined as exactly 0.45359237 kg. Also equal to 16 avoirdupois ounces and to 7,000 grains. ton standard US (short) ton = 2000 lbs celsius A common unit of temperature fahrenheit unit for temperature on the scale in which water freezes at 32 and boils at 212 under standard conditions. nanometer .000000001 meters micrometer .000001 meters millimeter .001 meters centimeter .01 meters decimeter .1 meters dekameter 10 meters hectometer 100 meters kilometer 1000 meters megameter 1000000 meters angstrom 1/10000000000 meter inch unit of length in the (British) imperial and United States systems usually understood as 1/12 f a foot. Foot_US 12 inches foot 12 inches Foot_Gold_Coast 12 inches fathom 6 feet nauticalMile defined as exactly 1,852 meters (6,076.1 ft; 1.1508 mi). Historically, defined as one minute of latitude. yard 3 feet Yard_Indian This is an ESRI unit and the multiplier comes from ESRI. It may not be accurate. Link_Clarke This is an ESRI unit and the multiplier comes from ESRI. It may not be accurate. mile 5280 ft or 1609.344 meters nanosecond 1/1000000 of a second microsecond 1/100000 of a second millisecond 1/1000 of a second centisecond 1/100 of a second decisecond 1/10 of a second dekasecond 10 seconds hectosecond 100 seconds kilosecond 1000 seconds megasecond 1000000 seconds minute 60 seconds hour 3600 seconds kiloliter 1 cubic meter microliter 1/1000000 of a liter milliliter 1/1000 of a liter liter 1000 cm^3 gallon US liquid gallon quart US liquid quart bushel 1 bushel = 35.23907 liters pint US liquid pint meterCubed cubic meter centimeterCubed cubic meter inchCubed micromoles per square meter per second radian 2 pi radians comprise a unit circle. degree 360 degrees comprise a unit circle grad a plane angle equivalent to 1/400 of a full circle steradian standard unit of solid angle measure, it is the solid angle which cuts out an area on a sphere that is the square of the sphere's radius; as a ratio of two areas, it has no dimension megahertz megahertz kilohertz kilohertz hertz derived unit of frequency in the SI, defined as one cycle per second millihertz millihertz newton newton joule joule = N*m calorie unit of energy: amount of energy to raise the temperature of one gram of water by one degree Celsius at a pressure of one atmosphere. cal = 4.1868 J britishThermalUnit an energy unit: 1 btu = 1055.0559 J footPound 1 ft-lbs = 1.355818 J langley unit of energy density = 41840 joule/m^2, = 1 calorie/cm^2 lumen SI unit for the total quantity of visible light in a defined beam or angle. 1 lumen/m^2 = 1 lux. 1 lumen = 1 candela * steradian lux SI derived unit for illuminance, or luminous flux per unit area. 1 lx = 1 lm/m^2 = 1 cd * sr/m^2 becquerel SI derived unit of radioactivity. the activity of a quantity of radioactive material in which one nucleus decays per second, and equivalent to an inverse second, s^-1. gray SI derived unit of ionizing radiation, defined as the absorption of one joule of radiation energy per kilogram of matter (= 1 J/kg) sievert SI derived unit of ionizing radiation dose (health effect of low levels of ionizing radiation on humans). 1 Sv = 100 rem (rem is an older, non-SI unit) katal derived SI unit for quantifying enzymatic activity.A property of the catalyst (not rate of reaction), expressed in moles/second. henry SI derived unit for inductance; in SI base units: kg * m^2 * s^-2 * A^-2 megawatt unit of power, to quantify rate of energy transfer. 1 W = J/s kilowatt unit of power, to quantify rate of energy transfer. 1 W = J/s watt unit of power, to quantify rate of energy transfer. 1 W = J/s milliwatt unit of power, to quantify rate of energy transfer. 1 W = J/s megavolt Derived unit for electric potential, electric potential difference, and electromotive force. 1 V = kg * m^2 * s^-3 * A^-1 kilovolt Derived unit for electric potential, electric potential difference, and electromotive force. 1 V = kg * m^2 * s^-3 * A^-1 volt Derived unit for electric potential, electric potential difference, and electromotive force. 1 V = kg * m^2 * s^-3 * A^-1 millivolt Derived unit for electric potential, electric potential difference, and electromotive force. 1 V = kg * m^2 * s^-3 * A^-1 farad SI derived unit of electrical capacitance, the ability of a body to store an electrical charge. 1 F = s^4 * A^2 *m^-2 * kg^-1 ohm an electrical resistance between two points of a conductor when a constant potential difference of one volt, applied to these points, produces in the conductor a current of one ampere ohmMeter SI unit of electrical resistivity (fundamental property that quantifies how strongly a material opposes the flow of electric current). reciprocal of electrical conductivity. siemensPerMeter SI unit for conductivity, measure of a material's ability to conduct an electric current. siemensPerCentimeter SI unit for conductivity, measure of a material's ability to conduct an electric current. siemens SI derived unit of electric conductance, susceptance and admittance (reciprocals of resistance, reactance, and impedance respectively). One siemens is equal to the reciprocal of one ohm (and also called "mho") weber the SI unit of magnetic flux tesla unit for flux density. 1 tesla = 1 Wb/m^2 (one weber per square meter). pascal SI derived unit of pressure, 1 pascal = 1 newton/m^2 megapascal SI derived unit of pressure, 1 pascal = 1 newton/m^2 kilopascal SI derived unit of pressure, 1 pascal = 1 newton/m^2 hectopascal SI derived unit of pressure, 1 pascal = 1 newton/m^2 atmosphere unit of pressure defined as 101325 Pa (1.01325 bar), sometimes used as a reference or standard pressure bar non-SI unit for pressure (deprecated in some fields). 1 bar = 100000 Pa millibar non-SI unit for pressure (deprecated in some fields). 1 millibar = 1 hPa (100 Pa) decibar non-SI unit for pressure. 1 decibar = .1 bar. Decibars are commonly used in aquatic environments because 1 db is approximately equal to depth in meters. tonnePerHectare metric ton or tonne per hectare gramPercentimeterSquared grams per square meter gramPerMeterSquared grams per square meter kilogramPerHectare kilograms per hectare kilogramPerMeterSquared kilograms per square meter milligramPerMeterSquared milligrams Per Square Meter poundPerAcre avoirdupois pounds per acre poundPerInchSquared avoirdupois pounds per square inch gramPerCentimeterCubed grams per cubic centimeter gramPerLiter grams per liter gramPerMilliliter grams per milliliter microgramPerLiter micrograms/liter milligramPerLiter milligrams/liter milligramPerMeterCubed milligrams Per Cubic Meter kilogramPerMeterCubed kilograms per cubic meter megagramPerMeterCubed megagrams per cubic meter milligramPerMilliliter micromoles per square meter per second milligramPerMeterCubedPerDay milligram per cubic meter per day gramPerDayPerLiter grams Per (Liter Per Day) footCubedPerSecond cubic feet per second literPerSecond liters per second meterCubedPerSecond cubic meters per second are 100 square meters hectare 1 hectare is 10^4 square meters acre 1 acre = 4046.8564 square meters or 1 hectare = 2.4710 acres centimeterSquared square centimeter footSquared 12 inches squared kilometerSquared square kilometer meterSquared square meters mileSquared 1 mile squared millimeterSquared square millimeter yardSquared 36 inches squared bushelPerAcre bushels per acre, 1 bushel = 35.23907 liters/1 acre = 4046.8564 squareMeters literPerHectare liters per hectare literPerMeterSquared liters per square meter meterCubedPerHectare meter cubed per hectare meterCubedPerMeterSquared meter cubed per meter squared meterSquaredPerHectare meter squared per hectare meterSquaredPerKilogram square meters per kilogram centimeterPerSecond centimeters per second footPerDay feet per day footPerHour feet per hour footPerSecond feet per second inchPerHour inches per hour kilometerPerHour km/hr knot unit of speed equal to one nautical mile per hour, exactly 1.852 km/hour meterPerDay meters per day meterPerSecond meters per second milePerHour miles per hour milePerMinute miles per minute milePerSecond miles per second millimeterPerDay millimeters per day millimeterPerSecond millimeters per second yardPerSecond yards per second meterPerSecondSquared micromoles per square meter per second inverseMeter reciprocal of meter, or 1/meters inverseCentimeter also called reciprocal centimeter meterCubedPerKilogram cubic meters per kilogram micrometerCubedPerGram cubic micrometers per gram amperePerMeterSquared amperes per square meter, unit of current density amperePerMeter ampere per meter molePerMeterCubed moles per cubic meter molePerLiter moles per liter (perferred over molarity, as molarity refers only to dissolved substances) millimolePerLiter millimoles per liter micromolePerLiter micromoles per liter nanomolePerLiter nanomoles per liter millimolePerMeterCubed millimoles per cubic meter microequivalentPerLiter concentration of charge (on dissolved ions). conversions must know the name of the ion; a single multiplier to SI is not possible milliequivalentPerLiter concentration of charge (on dissolved ions). conversions must know the name of the ion; a single multiplier to SI is not possible equivalentPerLiter concentration of charge (on dissolved ions). conversions must know the name of the ion; a single multiplier to SI is not possible millimolePerGram millimoles per gram molePerGram moles per gram molePerKilogram moles per kilogram micromolePerGram millimoles per gram candelaPerMeterSquared candela Per Square Meter (1 lux) footSquaredPerDay square feet per day meterSquaredPerDay square meters per day meterSquaredPerSecond meters squared per second, SI unit for kinematic viscosity, specific relative angular momentum and thermal diffusivity. The unit may be better understood when phrased as "meter per second times meter" (velocity of an object with respect to a position). gramPerCentimeterSquaredPerSecond grams per square centimeter per second gramPerDayPerHectare grams Per Hectare Squared Per Day gramPerMeterSquaredPerYear grams per square meter per year kilogramPerHectarePerYear kilograms Per Hectare Per Year kilogramPerMeterSquaredPerSecond kilograms per square meter per second kilogramPerMeterSquaredPerDay kilograms per square meter per day gramPerMeterSquaredPerDay grams per square meter per day milligramPerMeterSquaredPerDay milligram per square meter per day kilogramPerMeterSquaredPerYear kilograms per square meter per year molePerKilogramPerSecond moles per kilogram per second nanomolePerGramPerSecond nanomoles Per Gram Per Second nanomolePerGramPerHour nanomoles Per Gram Per Hour nanomolePerGramPerDay nanomoles Per Gram Per day micromolePerGramPerSecond micromoles Per Gram Per Second micromolePerGramPerHour micromoles Per Gram Per Hour micromolePerGramPerDay micromoles Per Gram Per day gramPerYear grams Per Year kilogramPerSecond kilograms per second tonnePerYear tonnes Per Year numberPerMeterSquared number per meter squared, e.g., for a population density. numberPerKilometerSquared number per kilometer squared numberPerHectare number per hectare numberPerMeterCubed number per meter cubed numberPerLiter number of entities per liter numberPerMilliliter number of entities per milliliter meterPerGram meters per gram numberPerGram number of entities per gram gramPerGram grams per gram milligramPerKilogram milligrams per kilogram microgramPerGram micrograms per gram nanogramPerGram micrograms per gram microgramPerGramPerHour micrograms per gram per hour microgramPerGramPerDay micrograms per gram per day microgramPerGramPerWeek micrograms per gram per week nanogramPerGramPerHour nanoograms per gram per hour meterCubedPerMeterCubed milliliters per liter literPerLiter milliliters per liter milliliterPerLiter milliliters per liter microliterPerLiter milliliters per liter nanoliterPerLiter milliliters per liter molePerMole millimoles per mole millimolePerMole millimoles per mole micromolePerMole millimoles per mole nanomolePerMole millimoles per mole molePerKilogram micromoles per kilogram millimolePerKilogram micromoles per kilogram micromolePerKilogram micromoles per kilogram nanomolePerKilogram micromoles per kilogram percent percent, one part per hundred parts. a decimal ratio multipled by 100 permil permil, one part per thousand parts. a decimal ratio multipled by 1000 wattPerMeterSquared watts per square meter, also, 1 kilogram per second cubed (ie, a flux) kilowattPerMeterSquared kilowatts per square meter wattPerMeterSquaredPerSteradian watts per square meter, in a solid angle microwattPerCentimeterSquaredPerSteradian watts per square centimeter, in a solid angle wattPerMeterSquaredPerNanometer watts per square meter, per unit of wavelength microwattPerCentimeterSquaredPerNanometer watts per square centimeter, per unit of wavelength wattPerMeterSquaredPerNanometerPerSteradian watts per square meter, per unit of wavelength in a solid angle microwattPerCentimeterSquaredPerNanometerPerSteradian microwatts per square centimeter, per unit of wavelength, in a solid angle molePerMeterSquaredPerSecond micromoles per square meter per second micromolePerMeterSquaredPerSecond micromoles per square meter per second micromolePerCentimeterSquaredPerSecond micromoles per square centimeter per second megajoulePerMeterSquaredPerDay megajoules per square meter per day langleyPerDay Langley (Ly) per day. Ly is a unit of energy density = 41840 joule/m^2, = 1 calorie/cm^2