Physics
Difference between scalar and vector quantities
Any quantity which can be measured by any method is called a physical quantity. all the physical quantities are divided into two groups.
 scalar quantities
 vector quantities
Scalar Quantities
Definition : The physical quantities, which are completely specified by their magnitude only are called scalar quantities.
Examples : Mass, time, distance, speed, work, energy, temperature charge etc
Vector quantities
Definition : the physical quantities which are completely specified by their magnitude and direction both ae known as vector quantities.
Examples : Displacement, velocity, acceleration, force, momentum, torque, etc.
Difference between scalar and vector quantities
SCALAR QUANTITIES  VECTOR QUANTITIES 
Definition 

The physical quantities. which are completely specified by their
magnitude only, are called scalar quantities. 
The physical quantities, which are completely specified by their magnitude direction both are
called vector quantities 
Characteristics 

Scalar can be added, subtracted and Multiplied by a simple arithmetic method.  They are added, subtracted and multiplied by the geometric or trigonometric methods.

Representation 

Scalar can be represented by a number i.e.
50 seconds. 
A vector can be represented graphically by a directional line segment with an arrow. 
Examples 

Mass, volume, time, distance, speed, density, work, energy, temperature, etc.  Area, displacement, velocity, acceleration
force, momentum, torque, etc. 