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A scalar is a single force or quantity that is independent of other forces, such as speed. Speed can be 45 m/s or 60 mph. A vector is something that involves two forces, such â¦as velocity which is speed AND direction. For example, velocity can be 5 m/s North. 1 person found this useful.
That is, simply a number. This distinguishes scalars from say vectors or matrices that generally does not simply scale whatever it is multiplied by. so a scalar times a vector is the vector scaled, and a scalar times a matrix is the matrix scaled. a constant expression in programming is a value that cannot change.