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).
Units of measurement in France
During the early part of the twentieth century, the French introduced their own units of power - the "poncelet", which was defined as being the power required to raise a mass of 100 kg against standard gravity with a velocity of 1 m/s giving a value of 980.665 W. However, many other European countries defined their units of power (the "Pferdestärke" in Germany, the "paardekracht" in the Netherlands and the "cavallo vapore" in Italy) using 75 kg rather than 100 kg, which gave a value of 735.49875 W (about 0.985 HP). Eventually, the "poncelet" was replaced with the "cheval vapeur", which was identical to equivalent units of measure in neighbouring countries. In 1977, these units, along with the "stere" and the "livre" (and amongst others, the German "pfund") were proscribed by EEC Directive 71/354/EEC