# What are the different types of quantities? What are physical quantities?

There are 2 types of quantities in physics. They are
Scalar quantity: A scalar quantity is a quantity which has only magnitude. Eg. speed, distance, time, etc.
Vector quantity: A vector quantity has both magnitude and a direction. Eg. velocity, displacement, force, etc.
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Physical quantities:
• A physical quantity is the measurable property of an object or a system. Mass, time, speed, acceleration, temperature, force, pressure, power, energy, and, length are all physical quantities.
• Physical quantities are measured by comparing them with arbitrarily chosen internationally accepted standards called SI Units. Units are necessary to express physical quantities. For example, a metre is a unit of length and Celsius is a unit of temperature.
The International System of Units or the SI system is the internationally accepted unit of measurement for physical quantities. The SI units of various physical quantities are given below:

Physical Quantity - SI unit
1. Mass - kilogram
2. Time - second
3. Speed - m / s
4. Acceleration - m / s2
5. Temperature - Kelvin
6. Force - Newton
7. Pressure - Pascal
8. Power - Watt
9. Energy - Joule
10. Length - metres

Updated on: 10-Oct-2022

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