除了极少数外,几乎所有的物理量都有单位。一般地,物理量使用的是属于国际单位制的单位,如长度为米(m),时间为秒(s)。但为了某些场合使用上的方便,人们又规定了一些“常用单位”。由于物理量众多,使得同学们在记忆同一量的单位间的换算关系上,甚感困难。其实,只要留心,你就会发现,单位间的换算关系是有章可循的。下面就初中部分所涉及到的作一归纳,以供参考。 With only a handful, almost all physical quantities have units. In general, physical quantities use units belonging to the International System of Units, such as meters in length and seconds in seconds. However, for the convenience of use in some occasions, people also stipulate some “common units ”. Due to the large amount of physical quantities, students find it very difficult to memorize the conversions between the same units. In fact, as long as you pay attention, you will find that the conversion between units is a rule-based. The following part of the junior high school to make a summary for reference.