SI基本单位又称国际单位制，后者的英语是International System of Units(单位的国际体系)。International System of Units应该缩写为ISU吧？怎么会SI呢？如果你去查www.thefreedictionary的缩写(acronyms)词典, 对SI确实有一条释义是 International System of Units (metric system; more commonly seen as ISU)。但是同...
Noun1.SI unit- a complete metric system of units of measurement for scientists; fundamental quantities are length (meter) and mass (kilogram) and time (second) and electric current (ampere) and temperature (kelvin) and amount of matter (mole) and luminous intensity (candela); "Today the Unit...
电流(Current) I A 温度(Temperature) theta K 物质量 (Amount of Substance) N mol 发光强度(Luminous intensity) J cd 这套单位标准是1960年称为国际统一共识。 更改原因 所以他们为啥需要费那么大劲去改变原有的定义呢? 以质量为例,1 kg的砝码被称作国际公斤原器 (The International Prototype of the Kilogr...
Name Expression in terms of other units Expression in terms of SI base units Hz1/s s−1 rad m/m dimensionless sr m2/m2dimensionless N, kg·m/s2kg·m·s−2 Pa, N/m2kg·m−1·s−2 J, , N·m = C·V = W·s kg·m2·s−2 W, J/s = V·A kg·m2·s−3 C or...
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 Nam...
SI unit 美[ˌes ˈaɪ ˌjunɪt] 英[ˌes ˈaɪ ˌjuːnɪt] un.国际制单位;SI单位 网络公制单位;国际单位;国际单位制单位 复数:SI units 英英 网络释义 n. 1. SystèmeInternationalunit:astandardscientificunitofmeasurementinaninternationalsystem.Themainunitsarethemeter,kilogram,second...
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
State true or false. If false, write correct sentence. To convet SI unit of heat into its CGS unit, conversion factor used is 4.18 View Solution Doubtnut is No.1 Study App and Learning App with Instant Video Solutions for NCERT Class 6, Class 7, Class 8, Class 9, Class 10, Class ...
high temperaturemeasurementplutonium oxidestemperaturethermal conductivityuranium dioxide uranium oxides uo$sub 2$/thermal conductivity at 25 to 850--cplutonium oxides puo$sub 2$/thermal conductivity at 25 to 850--cYoulten LJ.doi:10.1007/BF00831148...