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Metric horsepower (PS, cv, hk, pk, ks, ch)

One metric horsepower is needed to lift 75 kilograms by 1 metre in 1 second.

The various units used to indicate this definition (PS, KM, cv, hk, pk, ks and ch) all translate to horse power in English. British manufacturers often intermix metric horsepower and mechanical horsepower depending on the origin of the engine in question.

DIN 66036 defines one metric horsepower as the power to raise a mass of 75 kilograms against the Earth's gravitational force over a distance of one metre in one second: 75 kg × 9.80665 m/s² × 1 m / 1 s = 75 kgf⋅m/s = 1 PS. This is equivalent to 735.49875 W, or 98.6% of an imperial mechanical horsepower. In 1972, the PS was replaced by the kilowatt as the official power-measuring unit in EEC directives

source: Wikipedia