ADDITIONAL UNITS 附加单位
Listed below are a few of the non-SI units that are commonly used with the International System.
如下所列的几个非国际制度单位通常用于国际制度
UNITQUANTITYSYMBOL
单位数量符号
angstrom ( = 10 -10m)lengthA
埃(=10 -10米)长度
electron-volt ( = 0.160 aJ) energyeV
电子伏特(=0.160焦耳)能量
hectare ( = 10,000 m2)land areaha
公顷(=10,000平方米)面积
liter ( = 1.0 dm3)volume or capacityl
升(=1.0立方米)容积或容量
standard atmosphere (= 101.3 kPa) pressureatm
标准大气压(=101.3毫巴)压强
DERIVED UNITS 导出单位
Most of the units in the International System are derived units, that is units defined in terms of base units and supplementary units. Derived units can be divided into two groups - those that have a special name and symbol, and those that do not.
国际制度中大多数单位都是衍生单位，即以基本单位和补充单位的方式加以解释的单位。衍生单位可分为两组──具有特定名称和符号的一组，不具有特定名称和符号的一组
。