Page 300 - Mechanical Engineer's Data Handbook

General data

8.1 Units and symbols

8. I. I Symbols and units for physical
quantities

Quantity Symbol Unit Quantity Symbol Unit

Acceleration: gravitational ms-' Electric flux density D Cm-2
linear ms-' Energy W J
Admittance S Energy: internal u, E J
Altitude above sea level m specific internal u, e kJkg-'
Amount of substance mol Enthalpy H J
Angle: plane rad Enthalpy, specific h kJkg-'
solid steradian Entropy S kJ K-'
Angular acceleration rads-' Expansion, coefficient B oc- 1
Angular velocity rad s-l of cubical
Area m' Expansion, coefficient U y- 1
Area, second moment of m4 of linear
Bulk modulus Nm-', Pa Field strength: electric E Vm-'
magnetic Am-'
Capacitance PF Flux density: electric
Capacity I, m3 Cm-'
T
Coefficient of friction No unit magnetic
Coefficient of linear oc-I Flux: electric C
expansion magnetic Wb
Conductance: electrical G S Force N
thermal h kW m-' K-I Force, resisting N
Conductivity: electrical U kSmm-' Frequency Hz
thermal E. Wm-I K-' Frequency, resonant Hz
Cubical expansion, B oc- 1 Gravitational acceleration ms-'
coefficient of Gibbs' function J
Current, electrical I A Gibbs' function, specific kJ kg-'
Current density J A mm-'
Heat capacity, specific kJ kg-' K-'
Density P kg~r-~ Heat flow rate W
Density, relative d No unit Heat flux intensity kW m-'
Dryness fraction X No unit
Dynamic viscosity v Ns m-', CP Illumination lux
Impedance n
Efficiency v No unit Inductance: self H
Elasticity, modulus of E Nm-', Pa mutual H
Electric field strength E Vm-' Internal energy J
Electric flux dJ C Internal energy, specific kJkg-'