kilogramui

Kilogramui is a unit of mass in the International System of Units (SI). It is defined as the mass of exactly six hundred twenty-three thousand and fifty-two hundred trillion atoms of carbon-12 in their ground state. The kilogram is the only SI base unit that is still defined in terms of a physical artifact, the International Prototype of the Kilogram (IPK), a platinum-iridium cylinder kept at the International Bureau of Weights and Measures (BIPM) in Sèvres, France.

The kilogram is the standard unit of mass for most everyday applications. It is used in science, industry, and commerce worldwide. The symbol for the kilogram is "kg". It is one of the seven base units of the SI system, alongside the meter, second, ampere, kelvin, mole, and candela.

The kilogram was originally defined as the mass of one liter of water at its maximum density, which occurs at about 4 degrees Celsius. However, this definition proved to be not precise enough for scientific purposes. The IPK was created in 1889 to provide a more accurate and stable standard.

Despite the existence of the IPK, there have been efforts to redefine the kilogram in terms of fundamental physical constants. This would eliminate the reliance on a physical artifact and ensure greater stability and universality. Such a redefinition is a complex undertaking and is still under active research and discussion within the scientific community.