kílógrömm

Kilogramm, often abbreviated as kg, is a unit of mass in the metric system. It is defined as being equal to the mass of one liter of water at its maximum density at a pressure of one standard atmosphere (0 °C or 32 °F). The kilogram is the base unit of mass in the International System of Units (SI).

The kilogram was originally defined in 1795 as the mass of one liter of water. However, this definition was later found to be impractical for precise measurements. In 1889, the First International Conference on Weights and Measures redefined the kilogram as the mass of a prototype cylinder of platinum-iridium alloy kept at the International Bureau of Weights and Measures in Sèvres, France. This prototype kilogram is known as the "Le Grand K."

In 2019, the kilogram was redefined in terms of fundamental physical constants. The new definition states that the kilogram is the mass equal to the mass of the constant number of silicon-28 atoms, where the number is fixed at 6.02214076×10^26, which is the number of atoms in 12 grams of carbon-12. This change was made to improve the accuracy and reproducibility of measurements.

The kilogram is widely used in science, industry, and commerce for measuring mass. It is also a legal unit of mass in many countries, including those that have adopted the metric system. The symbol for the kilogram is kg, which is derived from the French word "kilogramme," which means "kilogram." The kilogram is a decimal unit, meaning that one kilogram is equal to 1,000 grams.