# Kilogram

kgmgmilligramkilogramsmilligramskilogrammeinternational prototype kilogramInternational Prototype of the Kilogramkilokilos
The kilogram or kilogramme (symbol: kg) is the base unit of mass in the International System of Units (SI).wikipedia
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### Mass

inertial massgravitational massweight
The kilogram or kilogramme (symbol: kg) is the base unit of mass in the International System of Units (SI).
The basic SI unit of mass is the kilogram (kg).

### International System of Units

SISI unitsSI unit
The kilogram or kilogramme (symbol: kg) is the base unit of mass in the International System of Units (SI).
It comprises a coherent system of units of measurement built on seven base units, which are the ampere, kelvin, second, metre, kilogram, candela, mole, and a set of twenty prefixes to the unit names and unit symbols that may be used when specifying multiples and fractions of the units.

### SI base unit

base unitbase unitsbase
The kilogram or kilogramme (symbol: kg) is the base unit of mass in the International System of Units (SI).
The SI base units and their physical quantities are the meter for measurement of length, the kilogram for mass, the second for time, the ampere for electric current, the kelvin for temperature, the candela for luminous intensity, and the mole for amount of substance.

### Planck constant

reduced Planck constantPlanck's constantreduced Planck's constant
The new definition is based on invariant constants of nature, in particular the Planck constant which will change to being defined rather than measured, thereby fixing the value of the kilogram in terms of the second and the metre, and eliminating the need for the IPK.
The Planck constant is of fundamental importance in quantum mechanics, and in physical measurement it is the basis for the definition of the kilogram.

### Litre

Lmlliter
The kilogram was originally defined as the mass of a litre (cubic decimetre) of water.
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 of water at the temperature of melting ice.

### Gram

ggramsmg
The gram, 1/1000 of a kilogram, was provisionally defined in 1795 as the mass of one cubic centimetre of water at the melting point of ice.
However, in a reversal of reference and defined units, a gram is now defined as one thousandth of the SI base unit, the kilogram, or 1×10 −3 kg, which itself is now defined by the International Bureau of Weights and Measures, not in terms of grams, but by "the amount of electricity needed to counteract its force"

### Physical constant

constantconstantsuniversal constant
After 20 May, it will be defined in terms of fundamental physical constants.
The new fixed values are based on the best measurements of the constants based on the earlier definitions, including the kilogram, to ensure minimal impact.

### Newton (unit)

kNnewtonN
Three other base units (cd, A, mol) and 17 derived units (N, Pa, J, W, C, V, F, Ω, S, Wb, T, H, kat, Gy, Sv, lm, lx) in the SI system are defined in relation to the kilogram, and thus its stability is important.
One newton is the force needed to accelerate one kilogram of mass at the rate of one metre per second squared in the direction of the applied force.

### Joule

JkJMJ
Three other base units (cd, A, mol) and 17 derived units (N, Pa, J, W, C, V, F, Ω, S, Wb, T, H, kat, Gy, Sv, lm, lx) in the SI system are defined in relation to the kilogram, and thus its stability is important.
where kg is the kilogram, m is the metre, s is the second, N is the newton, Pa is the pascal, W is the watt, C is the coulomb, and V is the volt.

### 2019 redefinition of SI base units

new definitionredefinition of SI base unitsproposed redefinition of SI base units
Until the 2019 redefinition of SI base units, it was also the last SI unit that was still directly defined by an artefact rather than a fundamental physical property that could be independently reproduced in different laboratories.
The kilogram, ampere, kelvin, and mole will then be defined by setting exact numerical values for the Planck constant (''

### Gray (unit)

grayGygrays
Three other base units (cd, A, mol) and 17 derived units (N, Pa, J, W, C, V, F, Ω, S, Wb, T, H, kat, Gy, Sv, lm, lx) in the SI system are defined in relation to the kilogram, and thus its stability is important.
It is defined as the absorption of one joule of radiation energy per kilogram of matter.

### Metre Convention

Convention of the MetreTreaty of the Metre[61]
The International Prototype Kilogram was commissioned by the General Conference on Weights and Measures (CGPM) under the authority of the Metre Convention (1875), and in the custody of the International Bureau of Weights and Measures (BIPM) who hold it on behalf of the CGPM.
The International Bureau of Weights and Measures (Bureau international des poids et mesures or BIPM) – the headquarters of the BIPM located at Sèvres, France that has custody of the International Prototype Kilogram and houses the secretariat for this organization and hosts its formal meetings.

### International Bureau of Weights and Measures

BIPMInternational Conference on Weights and MeasuresBIPM spelling
The International Prototype Kilogram was commissioned by the General Conference on Weights and Measures (CGPM) under the authority of the Metre Convention (1875), and in the custody of the International Bureau of Weights and Measures (BIPM) who hold it on behalf of the CGPM.
It has custody of the International Prototype of the Kilogram and houses the secretariat for this organization as well as hosting its formal meetings.

### Volt

VkVvolts
Three other base units (cd, A, mol) and 17 derived units (N, Pa, J, W, C, V, F, Ω, S, Wb, T, H, kat, Gy, Sv, lm, lx) in the SI system are defined in relation to the kilogram, and thus its stability is important.
Additionally, it is the potential difference between two points that will impart one joule of energy per coulomb of charge that passes through it. It can be expressed in terms of SI base units (m, kg, s, and A) as

### Metric prefix

prefixunit prefixdecimal
The kilogram is the only named SI unit with an SI prefix (kilo) as part of its name.
In use, the kilogram, gram, milligram, microgram, and smaller are fairly common.

### United States customary units

USUS customaryU.S. customary
The avoirdupois (or international) pound, used in both the imperial and US customary systems, is now defined in terms of the kilogram.
The majority of U.S. customary units were redefined in terms of the meter and the kilogram with the Mendenhall Order of 1893 and, in practice, for many years before.

### Ohm

Ωohms
Three other base units (cd, A, mol) and 17 derived units (N, Pa, J, W, C, V, F, Ω, S, Wb, T, H, kat, Gy, Sv, lm, lx) in the SI system are defined in relation to the kilogram, and thus its stability is important.
in which the following units appear: volt (V), ampere (A), siemens (S), watt (W), second (s), farad (F), henry (H), joule (J), kilogram (kg), metre (m), and coulomb (C).

### Pascal (unit)

hPakPaMPa
Three other base units (cd, A, mol) and 17 derived units (N, Pa, J, W, C, V, F, Ω, S, Wb, T, H, kat, Gy, Sv, lm, lx) in the SI system are defined in relation to the kilogram, and thus its stability is important.
where N is the newton, m is the metre, kg is the kilogram, s is the second, and J is the joule.

### General Conference on Weights and Measures

CGPMCGPM conferenceCGPM (General Conference on Weights and Measures)
The International Prototype Kilogram was commissioned by the General Conference on Weights and Measures (CGPM) under the authority of the Metre Convention (1875), and in the custody of the International Bureau of Weights and Measures (BIPM) who hold it on behalf of the CGPM. The new definition was approved by the General Conference on Weights and Measures (CGPM) on 16 November 2018.
Initially the Metre Convention was only concerned with the kilogram and the metre, but in 1921 the scope of the treaty was extended to accommodate all physical measurements and hence all aspects of the metric system.

### Metrology

metrologicalmetrologistlegal metrology
Copies of the IPK kept by national metrology laboratories around the world were compared with the IPK in 1889, 1948, and 1989 to provide traceability of measurements of mass anywhere in the world back to the IPK.
Scientific metrology, through the development of the Kibble balance and the Avogadro project, has produced a value of Planck constant with low enough uncertainty to allow for a redefinition of the kilogram.

### Tesla (unit)

teslaTteslas
Three other base units (cd, A, mol) and 17 derived units (N, Pa, J, W, C, V, F, Ω, S, Wb, T, H, kat, Gy, Sv, lm, lx) in the SI system are defined in relation to the kilogram, and thus its stability is important.
kg = kilogram

### Gravitational field

gravitationalgravitational fieldsgravity field
While the weight of an object is dependent on the strength of the local gravitational field, the mass of an object is independent of gravity, as mass is a measure of the quantity of matter.
Thus, a gravitational field is used to explain gravitational phenomena, and is measured in newtons per kilogram (N/kg).

Three other base units (cd, A, mol) and 17 derived units (N, Pa, J, W, C, V, F, Ω, S, Wb, T, H, kat, Gy, Sv, lm, lx) in the SI system are defined in relation to the kilogram, and thus its stability is important.
s⋅A⋅m⋅kg

### MKS system of units

MKSMKS systemmeter–kilogram–second
In 1935 this was adopted by the IEC as the Giorgi system, now also known as MKS system,
The MKS system of units is a physical system of measurement that uses the metre, kilogram, and second (MKS) as base units.

### Henry (unit)

henryhenriesH
Three other base units (cd, A, mol) and 17 derived units (N, Pa, J, W, C, V, F, Ω, S, Wb, T, H, kat, Gy, Sv, lm, lx) in the SI system are defined in relation to the kilogram, and thus its stability is important.
The henry is a derived unit based on four of the seven base units of the International System of Units: kilogram (kg), metre (m), second (s), and ampere (A).