| 释义 |
数量级shùliàngjí用来量度或估计某些物理量大小的一种概念。当一个物理量的数值写成以10为底的指数表达式时,指数的数目就是这个物理量的数量级。如地球赤道半径为6,378公里,可以写成6.378×103公里或6.378×10?厘米。就公里来说,它的数量级是3;就厘米来说,它的数量级是8。{order of magnitude; concept for measuring or estimating the magnitude of a physical quantity. When the numerical value of a physical quantity is represented as an exponent with 10 as the base, the index is the order of magnitude of this physical quantity. For example, the equatorial radius of the earth is 6,378 km., which can be expressed as 6.378×103km. or 6.378×10?cm. If counted by km., the order of magnitude is 3, while if counted by cm., the order is 8.} |