The pièze () is the unit of pressure in the metre–tonne–second system of units (mts system), used, e.g., in the former Soviet Union 1933–1955. It is defined as one sthène per square metre. The symbol is pz. {| |- |rowspan=6 valign=top|one pièze||= |align=right| 1 || kilopascal |- |= |align=right| 10 || millibars |- |≈ |align=right| || standard atmospheres |- |≈ |align=right|7.501 || torrs |- |≈ |align=right|0.1450 || pounds per square inch |- |≈ |align=right|0.2953 || inches of mercury |} References Obsolete units of measurement Units of pressure Non-SI metric units Metre–tonne–second system of units