MKS units
The metre, kilogram, second system of units, also known more briefly as MKS units or the MKS system,[1][2][3] is a physical system of measurement based on the metre, kilogram, and second (MKS) as base units. Distances are described in terms of metres, mass in terms of kilograms and time in seconds. Derived units are defined using the appropriate combinations, such as velocity in metres per second. Some units have their own names, such as the newton unit of force which is the combination kilogram metre per second squared.
The modern
History
By the mid-19th century, there was a demand by
In 1901,
The rmks system (rationalized metre–kilogram–second) combines MKS with rationalization of electromagnetic equations.
The MKS units with the ampere as a fourth base unit is sometimes referred to as the MKSA system. This system was extended by adding the kelvin and candela as base units in 1960, thus forming the International System of Units. The mole was added as a seventh base unit in 1971.[6][7]
Derived units
Mechanical units
Quantity | Quantity symbol | Unit | Unit symbol | MKS equivalent |
---|---|---|---|---|
frequency | f | hertz | Hz | s−1 |
force | F | newton | N | kg⋅m⋅s−2 |
pressure | p | pascal | Pa | kg⋅m−1⋅s−2 |
energy | E | joule | J | kg⋅m2⋅s−2 |
power | P | watt | W | kg⋅m2⋅s−3 |
Electromagnetic units
Quantity | Quantity symbol | Unit | Unit symbol | MKSA equivalent |
---|---|---|---|---|
electric charge | Q | coulomb | C | s⋅A |
voltage | U | volt | V | kg⋅m2⋅s−3⋅A−1 |
electric capacitance |
C | farad | F | kg−1⋅m−2⋅s4⋅A2 |
electric resistance |
R | ohm | Ω | kg⋅m2⋅s−3⋅A−2 |
electric conductance |
G | siemens | S | kg−1⋅m−2⋅s3⋅A2 |
magnetic flux | ΦB | weber | Wb | kg⋅m2⋅s−2⋅A−1 |
magnetic flux density |
B | tesla | T | kg⋅s−2⋅A−1 |
electric inductance |
L | henry | H | kg⋅m2⋅s−2⋅A−2 |
See also
- Centimetre–gram–second system of units (CGS)
- Foot–pound–second system(FPS)
- List of metric units
- Metre–tonne–second system of units (MTS)
- Vacuum permeability § Systems of units and historical origin of value of μ0
- Vacuum permittivity § Rationalization of units
References
- ISBN 978-0-19-923399-1.
- ISBN 978-0-19-852917-0.
- ^ Fitzpatrick, Richard (2006-02-02). "mks units". Classical Mechanics: An Introductory Course. University of Texas at Austin. Retrieved 2024-03-04.
- ^ a b c Rowlet, Russ (May 2, 2018). "Units: CGS and MKS". University of North Carolina at Chapel Hill. Retrieved May 4, 2021.
- ^ "What makes a system of units coherent?". Sizes, Inc. 2003. Retrieved May 4, 2021.
- ^ a b c "Brief history of the SI". National Institute of Standards and Technology. December 12, 2017. Retrieved May 4, 2021.
- ^ a b c d "The International System of Units (SI)" (PDF). Bureau International des Poids et Mesures. 2006. Retrieved May 4, 2021.
- ^ Giovanni Giorgi (1901), "Unità Razionali de Elettromagnetismo", in Atti dell' Associazione Elettrotecnica Italiana.
- S2CID 112215565.
- ^
PMID 16577693