A series of 5, 2, 1, 0.5 and 0.2 kilogram weights, made out of rusty cast iron
General information
Unit system
SI
Unit of
mass
Symbol
kg
Conversions
1 kg in ...
... is equal to ...
Avoirdupois
≈ 2.204623 pounds[Note 1]
British Gravitational
≈ 0.0685 slugs
CGS units
1000 grams
Atomic mass units
6.02214076×1026 Da
The kilogram (also kilogramme[1]) is the base unit of mass in the International System of Units (SI), having the unit symbol kg. It is a widely used measure in science, engineering and commerce worldwide, and is often simply called a kilo colloquially.[2] It means 'one thousand grams'.
The kilogram is a SI base unit, defined in terms of two other base units, the second and the metre and the Planck constant, a SI defining constant.[3]: 131 A properly equipped metrology laboratory can calibrate a mass measurement instrument such as a Kibble balance as a primary standard for the kilogram mass.[4]
The kilogram was originally defined in 1795 during the French Revolution as the mass of one litre of water. The current definition of a kilogram agrees with this original definition to within 30 parts per million. In 1799, the platinum Kilogramme des Archives replaced it as the standard of mass. In 1889, a cylinder of platinum-iridium, the International Prototype of the Kilogram (IPK), became the standard of the unit of mass for the metric system and remained so for 130 years, before the current standard was adopted in 2019.[5]
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^Merriam-Mebster definition of Kilo
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^"Mise en pratique for the definition of the kilogram in the SI". BIPM.org. July 7, 2021. Retrieved February 18, 2022.
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The kilogram (also kilogramme) is the base unit of mass in the International System of Units (SI), having the unit symbol kg. It is a widely used measure...
The metre, kilogram, second system of units, also known more briefly as MKS units or the MKS system, is a physical system of measurement based on the metre...
The kilogram per cubic metre (symbol: kg·m−3, or kg/m3) is the unit of density in the International System of Units (SI). It is defined by dividing the...
International Prototype of the Kilogram (referred to by metrologists as the IPK or Le Grand K; sometimes called the ur-kilogram, or urkilogram, particularly...
which are the second (symbol s, the unit of time), metre (m, length), kilogram (kg, mass), ampere (A, electric current), kelvin (K, thermodynamic temperature)...
artifacts such as the standard kilogram. Effective 20 May 2019, the 144th anniversary of the Metre Convention, the kilogram, ampere, kelvin, and mole are...
which all units can be expressed in terms of seven base units: the metre, kilogram, second, ampere, kelvin, mole, and candela. In the metric system, multiples...
It is a metrological instrument that can realize the definition of the kilogram unit of mass based on fundamental constants. It was originally called the...
The scientific community examined several approaches to redefining the kilogram before deciding on a redefinition of the SI base units in November 2018...
time, the metre (sometimes spelled meter) for length or distance, the kilogram for mass, the ampere for electric current, the kelvin for thermodynamic...
caloric theory of heat. The large calorie, food calorie, dietary calorie, or kilogram calorie is defined as the amount of heat needed to raise the temperature...
One litre of liquid water has a mass of almost exactly one kilogram, because the kilogram was originally defined in 1795 as the mass of one cubic decimetre...
the mass of the system. The SI unit for specific enthalpy is joule per kilogram. It can be expressed in other specific quantities by h = u + p v , where...
of force is the newton (N), and mass has the SI unit kilogram (kg). One newton equals one kilogram metre per second squared. Therefore, the unit metre...
elettrotecnica italiana [it] (AEI) that the MKS system (which used the metre, kilogram and second as its base units) should be extended with a fourth unit to...
may be added to gram to indicate multiplication by one thousand: one kilogram is equal to one thousand grams. The prefix milli-, likewise, may be added...
in the International System of Units (SI) equal to one thousandth of a kilogram. Originally defined as of 1795 as "the absolute weight of a volume of pure...
is the mass of a substance which passes per unit of time. Its unit is kilogram per second in SI units, and slug per second or pound per second in US customary...
The tonne (/tʌn/ or /tɒn/; symbol: t) is a unit of mass equal to 1,000 kilograms. It is a non-SI unit accepted for use with SI. It is also referred to...
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