Question

differentiate between scalar quantity and vector quantity

Answer 1

A scalar quantity is a one dimensional measurement of a quantity, like temperature, or mass. A vector has more than one number associated with it. A simple example is velocity. It has a magnitude, called speed, as well as a direction

Answer 2

Vector quantity 
Vector is a measurement that refers to both the magnitude of the medium as well as the direction of the movement the medium has taken.
Example, Velocity,Displacement etc..

Scalar quantity 
Scalar is the measurement of a medium strictly in magnitude.
Example, Speed,Distance etc..