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Table of Quantities and Units


The following tables list some common physical, mechanical, and electrical quantities, along with their units and the corresponding symbols.

General Physical Quantities: These quantities are widely used in physics, mechanical engineering, electrical engineering, and other fields.

Quantity Symbol Unit Symbol for the Unit
acceleration a meters per second per second m/s2
angle θ or φ radian rad
degree °
angular frequency ω radians per second rad/sec
energy W joule J
force F newton N
pound lb
mass m kilogram kg
period T second s
power P watt W
time t second s
velocity v meters per second m/s
miles per hour mph

Mechanical Quantities: These quantities are used in statics, dynamics, strength of materials, and other areas studied by mechanical engineers.

Quantity Symbol Unit Symbol for the Unit
bending moment M pound inch lb·in
newton meter N·m
distributed load q pounds per inch lb/in
newtons per meter N/m
elastic modulus (also called Young's modulus) E pounds per square inch lb/in2
newtons per square meter N/m2
flexural rigidity EI pound inches squared lb·in2
newton meters squared N·m2
normal stress

σ

pounds per square inch lb/in2
newtons per square meter N/m2
second moment of area I inches to the fourth in4
meters to the fourth m4
shear force V pound lb
newton N
shear stress

τ

pounds per square inch lb/in2
newtons per square meter N/m2
spring rate k newtons per meter N/m
tension T newton N
pound lb
weight W newton N
pound lb

Electrical Quantities: These quantities are used in circuit analysis and other areas studied by electrical engineers.

Quantity Symbol Unit Symbol for the Unit
capacitance C farad F
charge Q coulomb C
current I ampere A
impedance Z ohm Ω
inductance L henry H
reactance X ohm Ω
resistance R ohm Ω
voltage V volt V