1 egg weighs about 50g, 1kg = 1000g. 1000 ÷ 50 = 20 (pieces). Twenty eggs weigh about 1 kg. 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 Planck constant 6.626070 15× 10? A unit of mass of J.S., almost as heavy as a liter of water.

The kilogram is a metric unit of measurement, and one kilogram is equal to one kilogram, which is equivalent to two kilograms in China. 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.

Kilogram is the unit of mass, and mass is equivalent to how many words are said every day. However, quality is actually an inertial attribute; In other words, an object will tend to maintain its current speed without external force. When an object with a mass of one kilogram is subjected to a force of one Newton, it will get an acceleration of one meter per second squared.

Early definition

1On April 7th, 795, gram was defined in France as the absolute weight of water in a cube with a side length of one hundredth meter at the melting temperature of ice. Because the mass involved in business is far more than one gram, and the quality based on water is inconvenient and unstable, it is necessary to manufacture a materialized instrument for the definition of quality water in business regulations.

Therefore, people made a temporary quality standard: the quality of a metal product is gram-kilogram 1000 times. At the same time, the work of accurately judging the water quality of one cubic decimeter (one liter) has also begun.