## Kilogram |

kilogram general information unit system si base unit unit of mass symbol kg conversions 1 kg *in ...**... is equal to ...*avoirdupois ≈ 2.205 pounds ^{[note 1]}british gravitational ≈ 0.0685 slugs the

**kilogram**(also**kilogramme**) is the ofbase unit in themass , formally themetric system (si), having the unit symbolinternational system of units **kg**. it is a widely used measure in science, engineering, and commerce worldwide, and is often simply called a**kilo**in everyday speech.the kilogram was originally defined in 1795 as the mass of one

oflitre . this was a simple definition, but difficult to use in practice. by the latest definitions of the unit, however, this relationship still has an accuracy of 30 ppm. in 1799, the platinumwater replaced it as the standard of mass. in 1879, a cylinder ofkilogramme des archives , theplatinum-iridium (ipk) became the standard of the unit of mass for the metric system, and remained so until 2019.international prototype of the kilogram ^{[1]}the kilogram was the last of the si units to be defined by a physical artefact.the kilogram is now defined in terms of the second and the metre, based on fixed fundamental constants of nature.

^{[2]}this allows a properly-equipped laboratory to calibrate a mass measurement instrument such as ametrology directly by measuring natural phenomena, with no need to use an artefact.kibble balance - definition of kilogram
- name and terminology
- redefinition based on fundamental constants
- si multiples
- see also
- notes
- references
- external links

Kilogram | |
---|---|

General information | |

Unit of | |

Symbol | kg |

Conversions | |

1 kg in ... | ... is equal to ... |

| ≈ 2.205 ^{[Note 1]} |

British Gravitational | ≈ 0.0685 |

The **kilogram** (also **kilogramme**) is the **kg**. It is a widely used measure in science, engineering, and commerce worldwide, and is often simply called a **kilo** in everyday speech.

The kilogram was originally defined in 1795 as the mass of one * Kilogramme des Archives* replaced it as the standard of mass. In 1879, a cylinder of

The kilogram is now defined in terms of the second and the metre, based on fixed fundamental constants of nature.^{[2]} This allows a properly-equipped