一(三十三)
在一(三十一)中谈到了单位换算,不妨再多说说单位换算。
最简单的单位换算莫过于乘/除10的倍数了。比如乘/除个100,1000都好说,挪小数点就可以了。最麻烦的换算是不以10的倍数为单位,这就完美的体现在公制和英制单位之间的换算上了。中国以前也用一些非公制单位,比如两,斤,尺,长,不过后来慢慢的就不怎么用了,全部转向公制单位了。可是美国却在日常生活中依然使用英制单位,几乎所有的换算都不是10的倍数,但大部分还算凑合。比如1英里是1.6公里,1加仑是3.8升,这些换算记住了也不算太糟糕。最惨的是美国人温度用华氏温度,比如天气预报中都是华氏温度。华氏(F)跟摄氏(C)的换算关系是:
瞬间晕头。华氏度减32,然后乘以5再除以9之后得到摄氏度,真是加减乘除几乎全部占齐了。如果要准确计算,还真得用计算器。不过日常生活中用不着那么精确,大概估个数就可以了。或者强迫自己习惯华氏度,也就省去这些复杂的换算了。
虽然美国人生活中用华氏度,可是做科研发论文还是得用摄氏度,有些时候用的还是绝对温度,开尔文。真不知道美国人这脑子换算过来换算过去,累不累啊。
零一系列汇总
一(三十三):本文
Posted from my blog with SteemPress : http://softmetal.vornix.blog/2018/12/19/%e4%b8%80%ef%bc%88%e4%b8%89%e5%8d%81%e4%b8%89%ef%bc%89/
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