The pièze is the unit of pressure in the meter-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 meter. The symbol is pz. 1 pz = : t/(m·s²) = 1000 kg/(m·s²) = 10³ Pa = 1 kPa = 0.01 bar