According to life experience and actual situation, as well as the understanding of quality unit and data size, we can know that gram is reused as a unit for measuring an egg; It is known that the measurement of an elephant will soon reuse the "ton" as the unit; Wang Xiaogang's weight is in kilograms, and a math book is in grams.

G is the unit of mass, one thousandth of a kilogram (kg), and one gram is the mass of 0.501×10 23c-12 atoms. The mass units of the meter, kilogram and second system in the international system of units are also one of the seven basic units of the international system of units.

Originally intended to be a newly issued standard device gram, the main unit of quality. However, due to the limitation of technology and measurement technology at that time, a standard device with the mass of 1000 times of gram was made, that is, the kilogram standard original device, which is also the reason why the mass unit in the international system of units is kilogram instead of gram.

Kilogram (symbol kg) is the basic unit to measure quality in the international system of units, and it is also one of the most commonly used basic units in daily life. One kilogram is defined as the mass of the international kilogram original device, which is almost as heavy as one liter of water.

The kilogram is the only basic unit prefixed by the international system of units, and it is also the only international unit still defined by artificial products (other units are defined by basic physical characteristics, which is convenient for different laboratories to copy).

Unit conversion:

1 kg =0.00 1 metric ton (or "ton"); 1kg = 1000g； 1 kg = 1000000 mg; 1 kg = 100000000 micrograms; 1 kg =2 kg; 1 kg = 1 kg; 1 kg =20 Liang.