Base quantity Symbol for quantity Symbol for dimension
length l, x, r, etc. L
mass m M
time, duration t T
electric current I, i I
thermodynamic temperature T Θ
amount of substance n N
luminous intensity Iv J
Table 1. SI base units
Base quantity SI base...
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Base quantity Symbol for quantity Symbol for dimension
length l, x, r, etc. L
mass m M
time, duration t T
electric current I, i I
thermodynamic temperature T Θ
amount of substance n N
luminous intensity Iv J
Table 1. SI base units
Base quantity SI base unit
________________________________ ____________________________
Name Symbol Name Symbol
length l, x, r, etc. meter m
mass m kilogram kg
time, duration t second s
electric current I, i ampere A
thermodynamic temperature T kelvin K
amount of substance n mole mol
luminous intensity Iv candela cd
Table 2. Examples of coherent derived units in the SI expressed in terms of base
units
Derived quantity SI coherent derived unit
__________________________________ ______________________________________
Name Symbol Name Symbol
area A square meter m2
volume V cubic meter m3
speed, velocity v meter per second m/s
acceleration a meter per second squared m/s2
wavenumber σ, ν
~ reciprocal meter m−1
density, mass density ρ kilogram per cubic meter kg/m
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