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).
English Engineering units
In English Engineering units, the pound mass and the pound force are distinct base units, and Newton's Second Law of Motion takes the form "F" = "ma"/"g", where "g" = 32.174 lb·ft/(lbf·s).