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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