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SUMMARY OF KEY QUANTITIES, SYMBOLS AND UNITS (cont’d)
Quantity Usual Symbols Usual Unit
Other Quantities (cont’d)
work w, W J
energy E, U, W J
potential energy E p J
kinetic energy k J
E
heat energy Q J
change of internal energy ΔU J
power P W
pressure p Pa
torque τ N m
-2
2
gravitational constant G N kg m
-1
gravitational field strength g N kg
gravitational potential φ J kg -1
angle θ °, rad
angular displacement θ °, rad
angular speed ω rad s -1
-1
angular velocity ω rad s
period T s
frequency f Hz
-1
angular frequency ω rad s
wavelength λ m
speed of electromagnetic c m s -1
waves
CXC A16/U2/17 107
