Specific force

Specific force (SF) is a mass-specific quantity defined as the quotient of force per unit mass.

It is a physical quantity of kind acceleration, with dimension of length per time squared and units of metre per second squared (m·s−2).

It is normally applied to forces other than gravity, to emulate the relationship between gravitational acceleration and gravitational force. It can also be called mass-specific weight (weight per unit mass), as the weight of an object is equal to the magnitude of the gravity force acting on it.

The g-force is an instance of specific force measured in units of the standard gravity (g) instead of m/s², i.e., in multiples of g (e.g., "3 g").