Length unit: millimeter, centimeter, decimeter, meter, kilometer. ....
Area unit: square millimeter, square centimeter, square decimeter, square meter, hectare and square kilometer. ....
Unit of volume: cubic millimeter, cubic centimeter (milliliter), cubic decimeter (liter), cubic meter. .....
Time unit: seconds, minutes and hours ....
Weight unit (mass unit): grams, kilograms, kilograms, tons. ....
The traditional units of length in China are Li, Zhang, Chi, Inch, Xun, Jie, Fu, Zhi, Yi, Bu, Chang, Ya, Yan, Ji, Rail, Luo, Millimeter, Li and Min. The basic transformation relationship is as follows:
1 ft = 10 ft; 1 ft = 10 inch; 1 inch = 10 points; 1 = 10%;
1 sheet ≈ 3.33m; 1 ft ≈3.33 decimeter; 1 inch ≈3.33 cm;
1km = 1000m； 1 meter (m) = 100 cm; 1 cm =10mm
1 Li = 150 sheets = 500m; 2 Li = 1 km (1000 m).
Extended data:
The order of area units from small to large is: mm? (square millimeters), centimeters? (square centimeter), dm? (square decimeter), m? (square meters), huh? (hectares), kilometers? (square kilometers). In the International System of Units (SI), the standard unit area is square meters (m2), and the area is a square area one meter long.
1 m3 = 1000 liter = 1000 cubic decimeter = 1 000,000 ml = 1000000 cubic centimeter = 1 000000 cubic millimeter.
1 liter = 1 decimeter cubic = 1000 ml = 1000 cubic centimeter = 1 000,000 cubic millimeter.
1 cubic feet = 1 (feet? ) =0.0283 cubic meters (m? ) =28.3 17 liters (liters) =28.3 17 cubic decimeter (dm? ) =283 17 cubic centimeter =283 17000 cubic millimeter
Time unit is one of the seven basic units. Length, time, mass, quantity of matter, illumination, current and (thermodynamic) temperature are seven basic units. The time units in this entry are arranged in descending order of time.
Now the daily day and night is 24 hours, while in ancient times it was 12 hours. When western mechanical clocks and watches were introduced into China, people called the time points of China and the West "Da Shi" and "Shi Shi" respectively. With the popularity of clocks and watches, people forget "Da Shi", and "Shi" is still in use today.
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