长度单位一旦确定,就会全社会通用,不能轻易更改,否则会引进度量衡的混乱甚至社会的动荡。而长度单位的最初确定,却并不神秘,有的非常有意思,甚至还很可笑。古书云:“身为度,称以出。”意思是说,长度的计量是根据人体的某一部位的长度作为标准的。夏朝时,大禹曾把自己的身高定为一丈,取其十等分,定为一尺。据说“丈夫”一词就是由此而来。汉字“尺”字是个象形字,好像一个人的手在测量物体时,拇指和共余四指张开分离时的形状。事实也正是如此,如今我们惯用的尺子,就是从人的手所丈量出来的长度演变而来。商朝时,一尺为0.1578米;西汉时,一尺为0.231米;隋朝时,一尺为0.273米;明朝时,一尺已变为0.33米。尺的长度不断增长的原因,是 Once the unit of length is determined, the whole society will be universal and can not be easily changed. Otherwise, chaos in the measurement scale or even social turmoil will be introduced. The initial determination of length units, but not mysterious, and some very interesting, and even ridiculous. Ancient Book Cloud: “As a degree, said that out. ” Meaning is that the length of the measurement is based on the length of a part of the body as a standard. In the summer and the dynasty, Dayu once set his height as a husband, taking ten deciles as one measure. It is said that the word “husband” is derived from this. Chinese characters “ruler ” is a pictograph, like a human hand measuring the shape of the object, the thumb and the remaining four fingers open when separated. In fact, it is true that nowadays our usual ruler evolves from the length measured by human hands. During the Shang dynasty, one foot was 0.1578 meters; in the Western Han Dynasty, one foot was 0.231 meters; in the Sui Dynasty, one foot was 0.273 meters; in the Ming Dynasty, one foot had become 0.33 meters. The reason why the length of the ruler is growing is