The energy that liquid of unit weight get from the pump is called pump lift. The pump lift includes

suction lift and it is similar to the pressure difference between pump outlet and pump inlet. 

The pump lift is expressed as H and the unit is meter (m). 

The pressure of the pump is expresses as P and its unit is Mpa, H=P/ρ. For example, if P=1kg/cm2， H=（lkg/ cm2)/(1000kg/ m3) 

H=(1kg/ cm2)/(1000KG/m3)=(10000KG/m2)/1000KG/m3=10m1Mpa=10kg/c m2,H=(P2-P1)/ρ (P2=outlet pressure P1=inlet pressure)