What are the seven fundamental units?
Seven fundamental units:
The fundamental units are the base units defined by the International System of Units, such units are not derived from any other unit, therefore they are called fundamental units
Seven fundamental units:
Unit | Physical Quantity | Symbol | Definition |
---|---|---|---|
meter | length | m | The length of the path traveled by light in a vacuum during the time interval of of a second ( CPGM, ); originally of the distance from the North Pole to the Equator through Paris, France. |
kilogram | mass | kg | The mass is equal to the International Prototype of the kilogram (CPGM, ) originally defined as the mass of () of water at . |
second | time | s | The duration of periods of the radiation corresponds to the transition between the two hyperfine levels of the ground state of the cesium- atom. |
ampere | electric current | A | The constant of current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed apart in a vacuum, would produce between these conductors a force equal to newton per meter of length. |
kelvin | thermodynamic temperature | K | The fraction of the thermodynamic triple point of water (approximately the fraction of the temperature difference between the freezing point and boiling point of water at pressure). |
mole | amount of a substance | mol | The amount of a substance of a system that contains as many elementary entities (atoms, molecules, ions, electrons, or other particles or specified groups of particles) as there are atoms in of carbon-. |
candela | luminous intensity | cd | The luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency and that has a radiant intensity in that direction of . |