pressure loss, Δp, pressure drop, head loss, baric gradient, hydraulic gradient
antud voomahu juures vee- või gaasiarvesti olemasolust põhjustatud vältimatu rõhu vähenemine torus, irrecoverable decrease in pressure, at a given flow rate, caused by the presence of the water meter in the pipeline, non-recoverable pressure drop caused by the presence of the meter in the pipeline, non-recoverable pressure drop caused by the presence of the turbine meter in the conduit, difference of pressure between two positions in the flow path, rõhu erinevus voo kahe asukoha vahel