Any ancient and modern unit of length depends on the length of human feet; A unit of length commonly used in English-speaking countries, equal to 1/3 yards or 12 inch.

Just like the English word "foot", the abbreviation of "foot" is ft. In ancient England, because there was no internationally recognized unit of measurement, people often measured the area of fields with their own feet. As time goes by, the length of one foot based on adult men is considered as a standard measurement recognized by Britain and other countries. The Germans made a move to let the first batch of people who came out of the church 16 measure the length of their left feet together and divide it by 16, and the quotient is one foot.

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/kloc-At the beginning of the third century, the scale of Britain was chaotic, and there was no unified standard in the whole country, which brought a lot of trouble to national trade.

The civil disputes caused by scales alone have greatly distressed the British royal family. They held 65,438+00 ministerial meetings to discuss this issue. After discussion, it is impossible to determine a unified standard. King John, who had signed the Magna Carta, stepped on one foot angrily, and then pointed to the sunken footprints and solemnly announced to the ministers: "There is a foot, let it be measured from today. Let this footprint always be the standard of measurement! )"?

The British Museum also treasures a rectangular frame made of alloy with a small expansion coefficient, and the hollow part is the standard length of the imperial foot. Because the king wears shoes, one foot is about 30 cm, and the standard length is 30.48 cm.