Before the Qin Dynasty (Warring States), one foot = several inches, and one inch = several centimeters. Please answer me quickly.

1, one foot in Qin is about 23. 1cm, 1 inch is about 2.3 1cm, 1 foot = 10 inch.

2. Other periods are converted into 1 ft.

In the Han Dynasty, one foot was about 2 1.35-23.75cm. ..

Sui dynasty was one foot 29.6cm.

One foot 30.7cm in Tang Dynasty.

One foot 3 1.68cm in Song and Yuan Dynasties.

Woodworking in Ming and Qing dynasties was 3 1. 1cm.

3. Now 1 ft =33.33 cm.

Extended data:

China ancient weights and measures and the development of mathematics, physics, astronomy, law, architecture, smelting and other science and technology play a mutually promoting role. In order to unify the weights and measures of Qin State, Shang Yang made a standard measuring tool in 344 BC, which was engraved with the inscription "Sixteen inches, five measures and one liter".

I have persisted until today. During the Warring States period, a standard measuring instrument, Shili, included three capacity units: liter, bean and capsule. "Kao Gong Ji" recorded in detail the technical conditions of bronze smelting and casting when making this measuring tool, as well as the size, capacity and weight of each quantity involved.

The length of Qin and Han dynasties is about 23 cm. In the Southern Dynasties, the Grand Master ordered Qian Lezhi to cast Zhang Heng's armillary sphere according to the length of feet (now 24.5cm). After Emperor Wendi of Sui Dynasty unified the whole country, he ordered unified measurement. The northern ruler (30 cm long) was used as the daily ruler for officials and people, and the southern ruler was used to measure the sun shadow from winter solstice to summer solstice.

The monks and their entourage in the Tang Dynasty measured the meridian, and the celestial ruler in the Song Dynasty and the celestial ruler marked by the Guo Shoujing Observatory in the Yuan Dynasty were all made in Sui and Tang Dynasties. 1975, the historian of astronomy found the scale of the celestial ruler at that time from the fragments of Tonggui made in the Ming Dynasty, and the scale length was 24.525 cm, which was consistent with the scale of Qian Le Hunqi.

1300 for more than 300 years, the ruler value of the celestial ruler has remained unchanged, ensuring the continuity and stability of astronomical measurement. If you use a ruler every day, the trend of the dynasty will become bigger.

In the middle and late Spring and Autumn Period, Chu made small weighing instruments-wooden scales and copper ring weights, which were used to weigh gold coins. A full set of ten ring rights * * *, that is, one baht, two baht, three baht, six baht, twelve baht, one or two, two or two, four or two, eight or two, and one catty. One baht weighs 0.69 grams, one or two Jin 15.5 grams, one kilogram 25 1.3 grams, and ten pieces add up to about 500 grams, which is two kilograms made in Chu.

The museum of Chinese history has a bronze balance bar in the Warring States period, with an arch shoulder knob and a threading hole in the middle and a bisector running through the top and bottom, which is one foot long during the Warring States period.

The form is different not only from the balance beam, but also from the balance beam. It may be a weighing instrument between a balance and a steelyard. The Warring States not only widely used weighing instruments, but also had a thorough understanding of the principle of leverage. Mo Jing Xia Jing has an incisive exposition. After Qin and Han Dynasties, steelyard became popular.

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