Shang Yang Fang Sheng is a standard measuring instrument released by Qin Xiaogong in 18 (the first 344 years). After the unification of the Qin Dynasty, the imperial edict of the 26th year of Qin Shihuang was engraved on the bottom of Shang Yang Fang Sheng, and it continued to be used as a standard measuring instrument. On the side of Fang Sheng of Shang Yang, there is an inscription "Sixteen statues (inches) and five cents (inches) are one liter", that is, the volume of 16 1/5 cubic inches is one liter. In recent years, after repeated measurements, the volume of this liter is 202.5438+05 cubic centimeters.
Convert 16 1/5 cubic inches and 202. 15 cubic centimeters to get 1 cubic inches = 12.478 cubic centimeters, and then calculate 1 foot = 23.2 centimeters, which is not only the quotient.
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Qin Shihuang's unified currency, like unified writing and unified measurement, has great historical significance. Because of the unification of monetary system, it overcame the disorder of currency caused by feudal lords' separatist regime in the past, greatly facilitated the exchange of goods and economic exchanges throughout the country, was also conducive to the tax collection of feudal countries, promoted the development of economic unity, and was an important condition for consolidating national political unity.
This grand event ushered in a new era in the history of China's currency, abolished the primitive feudal miscellaneous coins such as knife coins, cloth coins and ant nose coins, and chose the most advanced currency form, which made China's currency enter the track of standardization. Because of its easy penetration, portability and low wear rate, this round square hole coin became the main form of copper coins in China feudal dynasty.
Baidu encyclopedia-Qin weights and measures