SCALAR QUANTITY VS VECTOR QUANTITY
| Scalar Quantity | Vector Quantity | 
| Definition: SCALAR QUANTITY is those physical quantities which have
  only magnitude, no direction.  | Definition: VECTOR QUANTITY is those physical quantities which have
  both magnitude as well as direction. | 
| SCALAR QUANTITY is always 1-dimensional.  | VECTOR QUANTITY can be 1-D, 2-D, or 3-D. | 
| SCALAR QUANTITY changes with change in its magnitude.  | VECTOR QUANTITY changes with change in its magnitude or direction or
  both.  | 
| SCALAR QUANTITY obey algebraic rule for operation such as addition
  and multiplication.  | VECTOR QUANTITY obey vector algebra rule for operation such as
  addition and multiplication.  | 
| SCALAR QUANTITY can divide another scalar quantity.  | VECTOR QUANTITY cannot divide another vector quantity.  | 
| SCALAR QUANTITY can be represented by an ordinary letter.  | VECTOR QUANTITY can be represented by a letter with a cap or arrow on it.
   | 
| SCALAR QUANTITY is described by a number and a suitable unit.  | VECTOR QUANTITY is described by a number, a suitable unit, and its
  direction.  | 
| SCALAR QUANTITY when multiplied with a scalar quantity always remains
  a scalar quantity.  | VECTOR QUANTITY when multiplied with a vector quantity can be a
  vector quantity or a scalar quantity.  | 
| Distance, Speed, Mass, etc. are SCALAR QUANTITIES  | Displacement, Velocity, Acceleration, etc. are VECTOR QUANTITIES.  | 

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