Kg is kilograms, which means kilograms. The units we often study in mathematics, such as length unit, time unit and weight unit, are all common units in our daily life. These units are also widely used, such as weight units for weighing, time units for watching time, and length units for measuring height. On the brand we often see in the vegetable market or fruit market, it will say how much is a kilogram of a certain vegetable.

The kilogram is the international basic unit of mass, with the symbol of kg, and it is one of the most commonly used basic units in daily life. One kilogram is defined as Planck constant 6.626070 15× 10? The mass unit of J.S. is almost as heavy as a liter of water, and the kilogram is the only basic unit with the prefix of the international system of units.

The development course of kilograms

179 1 year: 4℃ 1 cubic decimeter of pure water. The original device was platinum-iridium alloy, which was preserved in Paris and later called the international kilogram original device.

190 1 the third international metrology conference stipulated that the kilogram is the unit of mass, which is equal to the mass of the international kilogram original device, and the kilogram is represented by the symbol kg. The kilogram force is a commonly used unit of measurement in engineering technology, which is defined as the gravity of the international kilogram original device at the sea level of latitude 45, and the symbol is kgf. The word force is often omitted in engineering books, which is easily confused with the unit of quality. So in the last century, China stipulated that gravity is also called weight, and the unit is kilogram force.

In April 2008, researchers from the German National Institute of Metrology in Brunswick said that they would use pure silicon with a diameter of 10 cm to define a more standard measurement method.

Reference to the above content: Baidu Encyclopedia-kg