A scalar is simply a real number (sometimes complex numbers are used).
A vector has both a magnitude (a number), and a direction.
Examples: Mass is a scalar; a force is a vector (you may get different results if you pull in different directions).
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What are difference between scalars and vectors
Vectors have a direction associated with them, scalars do not.
Because scalars do not take in the direction but just the magnitude while vectors can. You can add vectors ONLY if they are in the same direction.
They both have a magnitude (size).
Vectors have direction. Scalars don't.