# Major physical quantities and their Units Image Source Sep 22, 2021 12:54 IST · 1 min read

The first table lists the base quantities used in the International System of Units to define the physical dimension of physical quantities for dimensional analysis. The second table lists the derived physical quantities.

## Base quantities

This table lists the base quantities used in the International System of Units to define the physical dimension of physical quantities for dimensional analysis.

Base quantity SI base unit
Length metre (m)
Mass kilogram (kg)
Time second (s)
Electric Current ampere (A)
Temperature kelvin (K)
Amount of substance mole (mol)
Luminous intensity candela (cd)

## Derived quantitie

This table lists the derived physical quantities, derived quantities can be mentioned in terms of the base quantities.

Derived quantity Description SI derived unit
Acceleration Rate of change of velocity per unit time: the second time derivative of position m/s2
Angular momentum Measure of the extent and direction of an object rotates about a reference point kg.m2/s
Area Extent of a surface m2
Capacitance Stored charge per unit electric potential farad (F = C/V)
Centrifugal force Inertial force that appears to act on all objects when viewed in a rotating frame of reference N.rad = kg.m.rad.s-2
Dynamic viscosity Measure for the resistance of an incompressible fluid to stress Pa.s
Electric charge The force per unit electric field strength coulomb (C = A.s)
Electrical resistance Electric potential per unit electric current ohm (Ω = V/A)
Energy Energy J
Entropy Logarithmic measure of the number of available states of a system J/K
Force Transfer of momentum per unit time newton (N = kg.m.s-2)
Frequency Number of (periodic) occurrences per unit time hertz (Hz = s-1)
Heat Thermal energy joule (J)
Magnetic field strength Strength of a magnetic field A/m
Moment of inertia Inertia of an object with respect to angular acceleration kg.m2
Momentum Product of an object's mass and velocity kg.m/s
Power Rate of transfer of energy per unit time watt (W)
Pressure Force per unit area pascal (Pa = N/m2)
Specific energy Energy density per unit mass J.kg-1
Specific heat capacity Heat capacity per unit mass J/(K.kg)
Stress Force per unit oriented surface area Pa
Surface tension Energy change per unit change in surface area N/m or J/m2
Temperature gradient steepest rate of temperature change at a particular location K/m
Thermal resistance Measure for the ease with which an object resists conduction of heat K/W
Torque Product of a force and the perpendicular distance of the force from the point about which it is exerted newton-metre (N.m)
Velocity Moved distance per unit time: the first time derivative of position m/s
Volume Three dimensional extent of an object m3
Wavelength Perpendicular distance between repeating units of a wave m
Weight Gravitational force on an object newton (N = kg.m/s2)
Work Transferred energy joule (J)
Young's modulus Ratio of stress to strain pascal (Pa = N/m2)

## Distance Conversion

Below is the table explaining the distance conversion for different units of distance:

Units Metre (m)
1 fermi 10 -15
1 angstrom 10 -10
1 nanometer 10 -9
1 millimeter (mm) 10 -3
1 centimeter (cm) 10 -2
1 metre (m) 1
1 kilometer (km) 10 3
1 Mile 1609.34
1 inch (in) 0.0254

1 Acre 4046.94 square meter
1 Hectare 2.5 acre

## Units of Mass

Mass is both a property of a physical body and a measure of its resistance to acceleration (rate of change of velocity with respect to time) when a net force is applied.

1 Ounce 28.35 gram
1 Pound 16 Ounce
1 Kilogram 2.205 Pound
1 Quintal 100 Kg
1 Metric Ton 1000 Kg

## Units of Volume

Volume is the quantity of three-dimensional space enclosed by a closed surface.

1 Gallon 3.786 Litre
1 Litre 1000 cubic cm
1 Barrel 42 US Gallon
1 Barrel 158.98 Liter