Pound per hour is a mass flow unit. It is abbreviated as PPH or more conventionally as lb/h. Fuel flow for engines is usually expressed using this unit, it is particularly useful when dealing with gases or liquids as volume flow varies more with temperature and pressure. \(1 lb/h = 0.4535927 kg/h = 126.00 mg/s\). Minimum fuel intake on a jumbojet can be as low as 150 lb/h when idling, however this is not enough to sustain flight.