<P> Note that neither the names nor the symbols used for the physical quantities are international standards . Some quantities are known as several different names such as the magnetic B - field which known as the magnetic flux density, the magnetic induction or simply as the magnetic field depending on the context . Similarly, surface tension can be denoted by either σ, γ or T . The table usually lists only one name and symbol . </P> <P> The final column lists some special properties that some of the quantities have, such as their scaling behavior (i.e. whether the quantity is intensive or extensive), their transformation properties (i.e. whether the quantity is a scalar, vector or tensor) or whether the quantity is conserved . </P> <Table> <Tr> <Th> Base quantity </Th> <Th> Symbol </Th> <Th> Description </Th> <Th> SI base unit </Th> <Th> Dimension </Th> <Th> Comments </Th> </Tr> <Tr> <Td> Length </Td> <Td> l </Td> <Td> The one - dimensional extent of an object </Td> <Td> metre (m) </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Mass </Td> <Td> m </Td> <Td> A measure of resistance to acceleration </Td> <Td> kilogram (kg) </Td> <Td> </Td> <Td> extensive, scalar </Td> </Tr> <Tr> <Td> Time </Td> <Td> </Td> <Td> The duration of an event </Td> <Td> second (s) </Td> <Td> </Td> <Td> scalar </Td> </Tr> <Tr> <Td> Electric current </Td> <Td> </Td> <Td> Rate of flow of electrical charge per unit time </Td> <Td> ampere (A) </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Temperature </Td> <Td> </Td> <Td> Average kinetic energy per degree of freedom of a system </Td> <Td> kelvin (K) </Td> <Td> Θ </Td> <Td> intensive, scalar </Td> </Tr> <Tr> <Td> Amount of substance </Td> <Td> mol </Td> <Td> Number of particles compared to the number of atoms in 0.012 kg of C </Td> <Td> mole (mol) </Td> <Td> </Td> <Td> extensive, scalar </Td> </Tr> <Tr> <Td> Luminous intensity </Td> <Td> </Td> <Td> Wavelength - weighted power of emitted light per unit solid angle </Td> <Td> candela (cd) </Td> <Td> J </Td> <Td> scalar </Td> </Tr> </Table> <Tr> <Th> Base quantity </Th> <Th> Symbol </Th> <Th> Description </Th> <Th> SI base unit </Th> <Th> Dimension </Th> <Th> Comments </Th> </Tr>

Basic s i units of any five physical quantities