Fundamental quantities Fundamental quantities are the basic quantities that are independent of other quantities. They cannot be defined in terms of other quantities or derived from them. Most of the derived quantities depend on them. Examples of fundamental quantities are Length, Mass, Time, Temperature, Electric current, Amount of substance, and Luminous intensity. Note: The three most important basic quantities in Physics are length, mass, and time Fundamental Units Fundamental units are the basic units upon which other units depend. They are the units of fundamental quantities. Examples of fundamental units are meter (m), kilogram (kg), seconds (s), kelvin (k), ampere (A), mole (mol), and candela (cd). Fundamental quantities and their units Fundamental quantities Units Symbols Length ...