Second, the kilogram of objects:
Two bottles of mineral water (1L water), weights, buckets, pans, one kilogram of eggs, one kilogram of bread, one kilogram of backpack, four math books 1K, one bottle of soy sauce and one bag of rice.
The units of measurement, grams and kilograms, were produced in ancient China. China is an ancient country with a long history of 5,000 years. The wisdom of its ancients found that time varies according to the length of sunshine and the changes of temperature, precipitation and snowfall in the four seasons, and the weight of different things is also different.
Extended data:
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. After the French Revolution, it was formulated by the French Academy of Sciences. 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.
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