kilogram-force

(Physics) unit of force that causes acceleration that is equal to the acceleration of gravity on one kilogram of mass

The unit kilogram-force (kgf, often just kg) or kilopond (kp) is defined as the force exerted by one kilogram of mass in standard Earth gravity. Although the gravitational pull of the Earth varies as a function of position on earth, it is here defined as exactly 9.80665  m/s². So one kilogram-force is by definition equal to 9.80665  newtons.
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