A scalar quantity has only magnitude and is completely specified by a number and a unit. Examples are mass (a stone has a mass of 2 Kg), volume (a bottle has a volume 1.5 liters), and frequency (house current has a frequency of ุ60 Hz). Scalar quantities of the same kind are added by using ordinary arithmetic.
A vector quantity has both magnitude are direction. Examples are displacement (an airplane has flown 200 km to the southwest), velocity (a car is moving 60 Km/h to the north), and force