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Tuesday, December 6, 2011


The quantities which can be measured are known as physical quantities. They are divided into two types.
1. Scalar quantities
2. Vector quantities or vectors.
Physical quantities which can be completely specified by number with suitable unit, without the mention of direction are known as scalars. The number representing the physical quantity is called its magnitude. Thus scalars can  also be defined as "The physical quantities which have only magnitude but no direction"
Examples of scalars are mass, volume, density, temperature, energy, electric potential, charge, time and distance etc.
Physical quantities which can be completely specified by a number with a suitable unit and direction are known as vectors. They can also be defined as "Physical quantities which have magnitude as well as direction are known as vectors"
Examples of such quantities are torque, acceleration, force, velocity, displacement, momentum and electric intensity etc.

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