Pressure measurement
Many other hybrid units are used such as mmHg/cm or grams-force/cm (sometimes as kg/cm without properly identifying the force units). Using the names kilogram, gram, kilogram-force, or gram-force (or their symbols) as a unit of force is prohibited in SI; the unit of force in SI is the newton (N).
Kilogram-force
The kilogram-force (kgf or kg), or kilopond (kp, from Latin "pondus" meaning "weight"), is a gravitational metric unit of force. It is equal to the magnitude of the force exerted on one kilogram of mass in a gravitational field (standard gravity, a conventional value approximating the average magnitude of gravity on Earth). Therefore, one kilogram-force is by definition equal to . Similarly, a gram-force is , and a milligram-force is . One kilogram-force is approximately 2.204622 pound-force.