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SI Units and Symbols used in the Guide Subject Physical Quantity Symbol Name Unit Mechanics Mass m, M kilogram kg Linear position Length, Distance Radius x, r l, d R meter m Time t, second s Linear angle, Angular position , radian rad Spherical angle steradian sr Area A m2 Volume V m3 Moment of inertia I kgm2 Density kgm3 Linear velocity v, u, c ms

SI Units and Symbols used in the Guide

Mechanics

Linear position Length, Distance Radius

x, r

l, d

R

Linear angle, Angular position , radian rad

Linear velocity v, u, c - m/s

Work Energy

W

Electricity and

Magnetism

Charge Q, q, e coulomb C=A*s

Volume charge

3

Surface charge

2

Linear charge

Electric potential Voltage

emf

Specific

Magnetic field B tesla T=N/(A*m) Magnetic flux weber Wb=T*m2=V*s Inductance

Mutual-inductance

L

Thermodynamics

Heat capacity Entropy

C

Elasticity modulus E

Oscillations and

Waves

Reactance Impedance

X

Optics

Luminous intensity I candela cd

Linear absorption

-1

Quantum Physics

Mass absorption

Radioactive activity A becquerel Bq=s-1