This chapter discusses a number of standard quantity symbols and their respective units. Acceleration can be of various types, such as gravitational, linear, angular acceleration, and angular velocity, and their quantity symbol is g, a, α, and ω, respectively. The symbol of time is t and its unit is second, whereas Torque (T) is measured Newton meter. The symbol of Young’s modulus of elasticity is E and its unit is Pascal (PA). The symbol of work is W and its unit of measurement is joule (J).
Quantity | Quantity symbol | Unit | Unit symbol |
Acceleration: gravitational | g | metres per second squared | m/s2 |
linear | a | metres per second squared | m/s2 |
Angular acceleration | α | radians per second squared | rad/s2 |
Angular velocity | ω | radians per second | rad/s |
Area | A | square metres | m2 |
Area, second moment of | I | (metre)4 | m4 |
Capacitance | C | farad | F |
Capacity | V | litres | I |
Coefficient of friction | µ | No unit | |
Coefficient of linear expansion | α | per degree Celsius | /°C |
Conductance | G | seimens | S |
Cubical expansion, coefficient of | γ | per degree Celsius | /°C |
Current | I | ampere | A |
Density | ρ | kilogram per cubic metre | kg/m3 |
Density, relative | d | no unit | |
Dryness fraction | x | no unit | |
Efficiency | η | no unit | |
Elasticity, modulus of | E | Pascal (1 Pa = 1 N/m2) | Pa |
Electric field strength | E | volts per metre | V/m |
Electric flux density | D | coulomb per square metre | C/m2 |
Energy | W | joules | J |
Energy, internal | U,E | joules | J |
Energy, specific internal | u, e | kilojoules per kilogram | kJ/kg |
Enthalpy | H | joules | J |
Enthalpy, specific | h | kilojoules per kilogram | kJ/kg |
Entropy | S | kilojoules per kelvin | kJ/K |
Expansion: coefficient of cubical | γ | per degree Celsius | /°C |
coefficient of linear | α | per degree Celsius | /°C |
coefficient of superficial | β | per degree Celsius | /°C |
Field strength: electric | E | volts per metre | V/m |
magnetic | H | ampere per metre | A/m |
Flux density: electric | D | coulomb per square metre | C/m2 |
magnetic | B | tesla | T |
Flux: electric | ψ | coulomb | C |
magnetic | Φ | weber | Wb |
Force | F | newtons | N |
Frequency | f | hertz | Hz |
Heat capacity, specific | c | kilojoules per kilogram kelvin | kJ/(kg K) |
Impedance | Z | ohm | Ω |
Inductance: self | L | henry | H |
mutual | M | henry | H |
Internal energy | U,E | joules | J |
specific | u, e | kilojoules per kilogram | kJ/kg |
Inertia, moment of | I,J | kilogram metre squared | kg m2 |
Length | l | metre | m |
Luminous intensity | I | candela | cd |
Magnetic field strength | H | ampere per metre | A/m |
Magnetic flux | Φ | weber | Wb |
density | B | tesla | T |
Magnetomotive force | F | ampere | A |
Mass | m | kilogram | kg |
Mass. rate of flow | V | cubic metres per second | m3/s |
Modulus of elasticity | E | Pascal | Pa |
rigidity | G | Pascal | Pa |
Moment of force | M | newton metre | N m |
Moment of inertia | I.J | kilogram metre squared | kg m2 |
Mutual inductance | M | henry | H |
Number of turns in a welding | N | no unit | |
Periodic time | T | second | s |
Permeability: absolute | µ | henry per metre | H/m |
absolute of free space | µo | henry per metre | H/m |
relative | µr | no unit | |
Permitivity: absolute | ε | farad per metre | F/m |
of free space | εo | farad per metre | F/m |
relative | εr | no unit | |
Polar moment of area | J | (metre)4 | m4 |
Power: apparent | S | volt ampere | VA |
active | P | watt | W |
reactive | Q | volt ampere reactive | VAr |
Pressure | p | Pascal (1 Pa = 1 N/m2) | Pa |
Quantity of heat | Q | joule | J |
Quantity of electricity | Q | coulomb | C |
Reactance | X | ohm | Ω |
Reluctance | S | per henry or ampere per weber | /H or A/Wb |
Resistance | R | ohm | Ω |
Resistivity | ρ | ohm metre | Ω m |
Second moment of area | I | (metre)4 | m4 |
Shear strain | γ | no unit | |
stress | τ | Pascal | Pa |
Specific gas constant | R | kilojoules per kilogram kelvin | kJ/(kg K) |
Specific heat capacity | c | kilojoules per kilogram kelvin | kJ/(kg K) |
Specific volume | v | cubic metres per kilogram | m3/kg |
Strain, direct | ε | no unit | |
Stress, direct | σ | Pascal | Pa |
Shear modulus of rigidity | G | Pascal | Pa |
Temperature coefficient of resistance | α | per degree Celsius | /°C |
Temperature, thermodynamic | T | kelvin | K |
Time | t | second | s |
Torque | T | newton metre | N m |
Velocity | v | metre per second | m/s |
angular | ω | radian per second | rad/s |
Voltage | V | volt | V |
Volume | V | cubic metre | m3 |
Volume, rate of flow | V | cubic metre per second | m3/s |
Wavelength | λ | metre | m |
Work | W | joule | J |
Young’s modulus of elasticity | E | Pascal | Pa |
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