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The kilopond or kilogram-force (kgf or kgF) (kp, from Latin pondus meaning weight), is a gravitational metric unit of force. It is equal to the magnitude of the force exerted by one kilogram of mass in a 9.80665 m/s2 gravitational field (standard gravity, a conventional value approximating the average magnitude of gravity on Earth).
The long ton-force (symbol: tnf) is a unit of force.