Physics - Measurement Units


The following table illustrates the major measuring units in physics −

Mass And Related Quantities
Quantity Symbol Unit
Density ρ kg.m-3
Volume V m-3
Force F Newton (N)
Torque M N.m
Pressure P Pascal (Pa)
Dynamic viscosity η Pa.s
Acoustic pressure p Pascal (pa)
Dynamic volume v m3
Electricity and Magnetism
Quantity Symbol Unit
Power P watt (W = J/s)
Energy W joule (J = N.m)
Magnetic field strength H ampère per metre (A/m)
Electric field E volt per metre (V/m)
quantity of electricity Q coulomb (C = A.s)
Electrical resistance R ohm (Ω = V/A)
electrical capacitance C farad (F = C/V)
Potential difference U volt (V = W/A)
International System of Units
meter m Length
kilogram kg Mass
second s Time
ampere A Electric Current
kelvin K Thermodynamic temperature
mole mol Amount of substance
candela cd Luminous intensity
radian rad Angle
steradian sr Solid Angle
hertz Hz Frequency
newton N Force, weight
pascal Pa pressure, stress
joule J energy, work, heat
watt W Power, radiant, flux
coulomb C Electric charge
volt V Voltage, electromotive force
farad F Electric capacitance
ohm Ω Electric resistance
tesla T Magnetic flux density
degree Celsius 0C Temperature
becquerel Bq radioactivity
henry H Magnetic induction
Angstrom Å Wave length

Conversion of Units

Unit I Value in another unit
1 Inch 2.54 centimeter
1 Foot 0.3048 meter
1 Foot 30.48 centimeter
1 Yard 0.9144 meter
1 Mile 1609.34 meter
1 Chain 20.1168 meter
1 Nautical mile 1.852 kilometer
1 Angstrom 10-10 meter
1 Square inch 6.4516 square centimeter
1 Acre 4046.86 square meter
1 grain 64.8 milligram
1 dram 1.77 gm
1 ounce 28.35 gm
1 pound 453.592 gram
1 horse power 735.499 Watt