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Units

Mechanics

Physical Quantity	Unit
Distance	[m]
Time	[sec]
Mass	[kg]
Mass density	[kg/m³]
Velocity	[m/sec]
Acceleration	[m/sec²]
Force	[Newton] = [kg-m/sec²]
Pressure	[N/m²] = [pascal]
Work or Energy	[Joule] = [N-m]
Momentum	[kg-m/sec]
Angle	degree or radian, both unitless
Angular velocity	radian [1/sec]
Angular acceleration	radian [1/sec²]
Torque	[m-N]
Angular momentum	[kg-m²/sec]
Moment of inertia	[kg-m²]

Electricity and Magnetism

Physical Quantity	Unit
Electric Charge	[Coulomb]
Electric Current	[Ampere] = [Coulombs/second]
Electric Field	[Newtons / Coulomb]
epsilon₀	[Coulomb² / meter² / Newton]
Electric Flux	[Coulomb meter²]
Electric Potential	[Volts] = [Joules / Coulomb]
Capacitance	[Farad] = [Coulombs / Volt]
Magnetic Field	[Tesla] = [Newton second / Coulomb / meter]
mu₀	[Tesla meter / Ampere]
Magnetic Flux	[Weber] = [Tesla meter²]
Inductance	[Henry] = [Volt seconds / Ampere]
Resistance	[Ohm] = [Volts / Ampere]

Note on SI Units

The basic SI units are the meter, kilogram, second, ampere, (degree) kelvin, and candela. All other units are derived from these six.

Last revised 1999/08/20