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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