List of SI Units PDF

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SI Units List

List of SI Units

The International System of Units (SI) is the modern form of the metric system and is the world’s most widely used system of measurement. It provides a coherent set of units for measuring physical quantities such as length, mass, time, temperature, electric current, luminous intensity, and amount of substance.

SI Units List

Sl. No. Name of the Quantity SI Unit SI Unit Symbol
1. Length (l) Meter m
2. Mass (M) Kilogram kg
3. Time (T) Second s
4. Electric current (I) Ampere A
5. Thermodynamic temperature (Θ) Kelvin K
6. Amount of substance (N) Mole mol
7. Luminous intensity (J) Candela cd

List of SI Units in Physics, Chemistry and Biology

Quantity Symbol Unit Definition
List of SI Units in Physics
Length l Meter (m) Distance traveled by light in vacuum in 1/299,792,458 sec
Mass m Kilogram (kg) Originally defined by a physical prototype, now Planck’s constant
Time t Second (s) Duration of 9,192,631,770 periods of radiation of cesium-133 atom
Electric Current I Ampere (A) Constant current producing specific force between conductors
Temperature T Kelvin (K) 1/273.16 of the thermodynamic temperature of triple point of water
Amount of Substance n Mole (mol) Amount containing Avogadro’s number of entities (atoms, molecules, etc.)
Luminous Intensity Iv Candela (cd) Luminous intensity of source emitting specific radiation
List of SI Units Chemistry
Amount of Substance n Mole (mol) Same as in physics
Energy E Joule (J) Work done by force of one newton over one meter
Electric Charge q Coulomb (C) Quantity of electricity flowing per second
Concentration C Mole per cubic meter (mol/m³) Amount of substance per unit volume
Pressure P Pascal (Pa) Force per unit area
Volume V Cubic meter (m³) Three-dimensional space occupied by an object
List of SI Units in Biology
Length l Meter (m) Same as in physics
Mass m Kilogram (kg) Same as in physics
Time t Second (s) Same as in physics
Temperature T Kelvin (K) Same as in physics
Concentration C Mole per liter (mol/L) Amount of substance per unit volume
Heart Rate HR Beats per minute (bpm) Number of heart beats per minute
Blood Pressure BP Millimeters of mercury (mmHg) Pressure exerted by blood against walls of blood vessels

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