Scalar quantity is a type of Physical quantity that has only magnitude. Examples: Volume, speed, time, density, mass and energy. It means the expression in scalar will give the complete meaning. Suppose the mass of a body is 10 kg. It means it has a unit here is Kg and a numerical value that is 10. So the parameters of scalar quantities are –

- A unit that expresses the measurement completely
- A number or a numerical value that makes it easy to understand that unit with an accurate number.

There are some pure scalars and this does not have any unit as pie or π, *e ^{2}* and some other similar types. A number of expressions are there in which you just need to understand that it has proper direction or not, in case you do not have proper knowledge about a scalar, then you can be confused as the only difference between a scalar and a vector is a proper direction.