Scalar and Vector QuantitiesA quantity that has only magnitude is said to be a scalar quantity. Examples of scalar quantities are time, mass, distance, temperature, work, electric potential, etc. Scalar quantities are represented by italic letters, e.g., A, B, a, b, and F.
A quantity that has both magnitude and direction is called a vector quantity. Examples of vector quantities are force, velocity, displacement, electric field intensity, etc. Vector quantities are represented by a letter with an arrow on the top, such as and or with a bold letter, such as F, a, B.