Units symbols and values

Table A1. Base units: Système Internationale (SI)a

Quantity Name Symbol

Length meter m

Mass kilogram kg

Time second s

Electric current ampere A

Thermodynamic temperature kelvin K

Amount of substance mole mol

Luminous intensity candela cd a National Institute of Standards and Technology (NIST) physics website. http://physics.nist.gov/cuu/Units/index.html

Table A2. Some SI derived unitsa

Quantity

Name

Symbol

Equivalent units

Plane angle

radian

rad

m/m = 1

Solid angle

steradian

sr

m2/m2 = 1

Frequency

hertz

Hz

cycles/s = s-1

Force

newton

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