SI unit n (Units) any of the units adopted for international use under the Système International d'Unités, now employed for all scientific and most technical purposes. There are seven fundamental units: the metre, kilogram, second, ampere, kelvin, candela, and mole; and two supplementary unit...
vacuum during a time interval of 1/299 792 458 of a second."17th CGPM (1983, Resolution 1, CR, 97)1⁄10,000,000 of the distance from the 's equator to the North Pole measured on the circumference through .kg "The kilogram is the unit of mass; it is equal to the mass of the...
(meter) m 质量(mass) 千克(公斤)(kilogram) kg 时间(time) 秒(second) s 电流(electriccurrent) 安培(ampere) A 热力学温度(thermodynamictemperature) 开尔文(kelvin) K 物质的量(amountofsubstance) 摩尔(mole) mol 发光强度(luminousintensity) 坎德拉(candela) cd 注:1.圆括号()中的名称,是其前的名称的...
MoleAmount of Substancemol Supplementary Units There are two supplementary units in the international system of units, which are given in the following table ? Supplementary UnitQuantityDescription Radian (rad)Plane AngleOne radian is defined as the plane angle subtended from the center of a circle ...
(SI) Units SI base units[9] Name Symbol Quantity metre m length kilogram kg mass second s time ampere A electric current kelvin K thermodynamic temperature candela cd luminous intensity mole mol amount of substance A prefix may be added to a unit to produce a multiple of the original unit....
The mole is the SI unit of the amount of substance. The mole is defined as the amount of substance that contains as many elementary entities as there are atoms in \(0.012\) kilogram of carbon-\(12\). The elementary entities may be atoms, molecules, ions, electrons, or any other partic...
TABLE D.1 SI UnitsSI Base UnitBase Quantity Name SymbolLength Meter mMass Kilogram kgTime Second sElectric current Ampere ATemperature Kelvin KAmount of substance Mole molLuminous intensity Candela cdTABLE D.2 Some Derived SI UnitsExpression in Expression inTerms of Base Terms of OtherQuantity Name...
Mass density ="Mass"/"Volume" therefore SI unit of mass density ="SI unit of mass"/"SI unit of volume" ="kg"/m^3 So, SI unit of mass density is kg//m^3
Base units can be combined to derive units of measurement for other quantities. In addition to the twodimensionlessderived unitsradian(rad) andsteradian(sr), 20 other derived units have special names. Named units derived fromSIbase units
Base units can be combined to derive units of measurement for other quantities. In addition to the twodimensionlessderived unitsradian(rad) andsteradian(sr), 20 other derived units have special names. Named units derived fromSIbase units