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What are physical quantities?
Physical Quantity :
* 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 Units.
* Units are necessary to express physical quantities
Example : unit of length - meter
unit of temperature - Kelvin
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