Fundamental Quantities
The seven fundamental quantities in the International System of Units (SI) are:
* Length (meter)
* Mass (kilogram)
* Time (second)
* Electric current (ampere)
* Thermodynamic temperature (kelvin)
* Amount of substance (mole)
* Luminous intensity (candela)
These quantities are considered fundamental because they cannot be defined in terms of other quantities. For example, length cannot be defined in terms of mass, time, or any other quantity.
Derived Quantities
All other physical quantities are derived quantities. They can be expressed in terms of the fundamental quantities. For example, speed is a derived quantity that can be expressed as the distance traveled divided by the time taken to travel that distance. Speed has units of meters per second (m/s).
Relationship between Fundamental and Derived Quantities
The relationship between fundamental and derived quantities can be represented by the following equation:
```
Derived quantity = Function of fundamental quantities
```
For example, the equation for speed is:
```
Speed = Distance / Time
```
In this equation, distance is a fundamental quantity and time is a fundamental quantity. Speed is a derived quantity that is expressed as a function of the fundamental quantities distance and time.
Conclusion
Fundamental and derived quantities are two important concepts in measurement. Fundamental quantities are those that cannot be expressed in terms of other quantities, while derived quantities are those that can be expressed in terms of fundamental quantities. The relationship between fundamental and derived quantities is represented by the equation:
```
Derived quantity = Function of fundamental quantities
```
