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 1dimensional. 
VECTOR QUANTITY can be 1D, 2D, or 3D. 
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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