Define physical quantities and derived quantities?

Physical quantities are properties of objects or phenomena that can be measured and expressed in numerical terms. Examples of physical quantities include length, mass, time, temperature, and electric current.

Derived quantities are quantities that are derived from one or more base quantities through mathematical relationships. These relationships can involve multiplication, division, addition, or subtraction of base quantities. Examples of derived quantities include velocity (derived from the base quantities of length and time), acceleration (derived from velocity and time), and density (derived from mass and volume).