常用单位可以分为质量，长度等17类。 每一类又包含很多可以单位， 每一类中的单位可以通过一定比例相互换算。
在自控工程计算中气体温度、压力补偿及常用单位换算是重要的。
Because different units are used in the calculation carried out in China and that carried out outside of China, the unit conversion, which may affect the calculation, is necessary.
在线数据快速地增长，TB (terabyte)、PB (petabyte)和EB (exabyte)以成为常用的数据单位。
Online data is growing rapidly, and terms like terabyte, petabyte, and exabyte are commonly used.
尔格和焦耳这两个新名称是很方便的缩写，因为他们是在全世界的科技工作中最常用来表示能量的两个单位。
The two new names, ergs and joules, are very convenient abbreviations, because they are the units most commonly used to express energy in scientific work all over the world.
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