A scalar actually represents the real numbers. A subset W of a vector space V is called a subspace of V if W is itself a vector space under the addition and scalar multiplication deļ¬ned on V. Scalar And Vector Quantities Physics Lessons Physics Classroom Learn Physics Other times they may be completely unrelated to the name of the physical quantities such as c symbolises the speed of light. . A scalar quantity is a physical quantity with only magnitudes such as mass and electric charge. However if W is part of a. A vector quantity has two characteristics magnitude and direction and both the quantities are compared while comparing two vector quantities of the same type. In Physics we often use the terms force speed velocity and work and these quantities are classified as a scalar or vector quantities. These equations are the fluid equivalent of Newtons laws of motion and are very difficult to solve and understand. Sometimes