Some thermodynamic functions of state are extensive: if the intensive variables (, , ) are kept constant, the extensive variables are proportional to the amount of substance present. Energy, volume, entropy, total magnetisation, enthalpy, Gibbs and Helmholtz free energies and heat capacities are all extensive. Extensive properties expressed per unit mass or per mole are then intensive, and are called specific: eg. specific heat capacity. All functions of state are either extensive or intensive.

Having wide extent; of much superficial extent; expanded; large; broad; wide; comprehensive; as, an extensive farm; an extensive lake; an extensive sphere of operations; extensive benevolence; extensive greatness.

Capable of being extended.

large in spatial extent or range; "an extensive Roman settlement in northwest England"; "extended farm lands"

having broad range or effect; "had extensive press coverage"; "far-reaching changes in the social structure"; "sweeping reforms"

large in number or quantity (especially of discourse); "she took copious notes"; "extensive press coverage"; "a subject of voluminous legislation"

of agriculture; increasing productivity by using large areas with minimal outlay and labor; "producing wheat under extensive conditions"; "agriculture of the extensive type"

economic development Expanding production by adding resources rather than by improving the efficiency with which these resources are exploited.