What is a scalar and what is a vector?

Answer 1

physical quantities having magnitude but not direction are scalars e.g mass, distance,work,energy,temperature area,volume charge etc while those physical which hav direction as well as magnitude are vectors e.gtorque,velocity,displacement,weight,force etc...

Answer 2

Scalar quantities are those which have magnitude but not any specific direction, but vector quantities have both magnitude and direction.

Answer 3

A scalar quantity is one in which a direction is not relevant. If a direction is specified as part of a measurement, then you would be using a vector.