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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 Subject Physical Quantity Symbol Name Unit Mass m, M kilogram kg Linear position Length, Distance Radius x, r l, d R meter m t, second s , radian rad steradian sr Time Linear angle, Angular position Spherical angle Area A - m2 Volume V - m3 Moment of inertia I - kg*m2 - kg/m3 - m/s - rad/s Density Mechanics Linear velocity Angular velocity v, u, c , Linear momentum p - kg*m/s Angular momentum L - kg*m2/s Linear acceleration a - m/s2 - rad/s2 newton N=kg*m/s2 - N*m Angular acceleration Force F Torque Impulse I - N*s Work Energy W E joule J=N*m Power P watt W=J/s - Pa*s Dynamic viscosity Electricity and Magnetism Current I ampere A Charge Q, q, e coulomb C=A*s Current density j - A/m2 Volume charge density - C/m3 Surface charge density - C/m2 Linear charge density - C/m Electric potential Voltage emf V volt V=J/C Electric field E - N/C, V/m - V*m C*m Electric flux Electric moment pe - Resistance R, r ohm =V/A - *m Specific resistance Capacitance C Specific conductivity Magnetic field B Magnetic flux Thermodynamics farad F=C/V ( *m)-1 tesla T=N/(A*m) weber Wb=T*m2=V*s Inductance Mutual-inductance L M henri H=Wb/A Magnetic moment pm - A*m2 Polarization P - C/m2 Magnetization I - A/m Temperature T kelvin K Substance quantity M mole mol Pressure P - Pa Heat Q - J Heat capacity Entropy C S - J/K Specific heat c - J/(kg*K) Molar heat cm - J/(mol*K) energy flux j - W/m2 Surface tension - N/m Stress pascal Pa=N/m2 Elasticity modulus E Wavelength Oscillations and Waves Optics Quantum Physics - m Wave number k - m-1 Frequency f hertz Hz - J/m3 Energy density Energy flux J - J/m2 Intensity I - J/(m2*s) Reactance Impedance X Z ohm Focal length f - m Luminous intensity I candela cd lumen lm=cd*m2 Luminous flux =V/A Illuminance E lux lk=lm/m2 Brightness L - cd/m2 Linear absorption coefficient - m-1 Mass absorption coefficient - m2/kg Radioactive activity A becquerel Bq=s-1 Absorbed dose D gray Gy=J/kg