Roymech engineering encyclopedia

ISO Units

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ISO Units

The fundamental units according to BS 5775-0:1993, ISO 31-0:1992 include length,  mass,  time,  electric current,  thermodynamic temperature,  amount of substance and luminous intensity.

In mechanical engineering the fundamental required units are length,  mass and time

Physical Unit Name Symbol
length metre m
mass kilogram kg
time second s
electric current ampere A
temperature kelvin K
luminous intensity candela cd
*plane angle radian rad
*solid angle steradian sr
Quantity of Matter mole mole