Base Units
What is Metric?The metric system is an internationally recognised decimalised system of measurement. It is in widespread use, and where it is adopted, it is the only or most common system of weights and measures. It is now known as the International System of Units. All countries in the world use it except the United States, Myanmar (Burma) and Liberia.
Base units:
Eight of these units are electromagnetic quantities:
Base units:
- The metre for length
- kilogram for mass
- second for time
- ampere for electromagnetism
- kelvin for temperature
- candela for luminous intensity
- mole for quantity
Eight of these units are electromagnetic quantities:
- Volt, a unit of electrical potential
- Ohm, a unit of electrical resistance
- Tesla, a unit of magnetic flux density
- Weber, a unit of magnetic flux
- Farad, a unit of electrical capacitance
- Henry, a unit of electrical inductance
- Siemens, a unit of electrical conductance (the inverse of ohm)
- Coulomb, a unit of electrical charge
- Watt, a unit of mechanical or electrical power
- Newton, a unit of mechanical force
- Joule, a unit of mechanical, electrical or thermodynamic energy
- Pascal, a unit of pressure
- Becquerel, a unit of radioactive decay
- Sievert, a unit of absorbed ionising radiation
- Gray, a unit of ionising radiation
- Lux, a unit of luminous flux
- Lumen, a unit of luminous intensity
- Radian, a unit of circular arc
- Steradian, a unit of spherical surface area
- Degree Celsius, a unit of thermodynamic temperature
- Katal, a unit of catalytic activity (enzymatic)
- Hertz, a unit of cycles per second (inverse of second)