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PHYSICAL QUANTITIES Physics deals with numerous physical quantities in terms of which the laws of physics are expressed. Volume, speed, force, time, mass, density, temperature, electric current e.t.c are few examples of physical quantities. Physical quantities classified into two categories: BASE AND DERIVED QUANTITIES We can define the base quantities as the minimum number of those physical quantities in terms of which other physical quantities can be defined. Derived quantities are those whose definitions are based on other physical quantities, that is, the base quantities. BASE AND DERIVED UNITS Base quantities are said to have base units and derived quantities have derived units. For example, if displacement (length) and time are chosen to be base quantities, then velocity is a derived quantity