Pressure drop
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Pressure drop is a term used to describe the change in pressure across a system. For example, in a typical garden hose the pressure in the hose is 40 psi and at sea level the atmospheric pressure is about 15 psi. Therefore, the pressure drop across the nozzle is 25 psi.
"Pressure Drop" is also the name of a song by the Toots & the Maytals and an early album by Robert Palmer (featuring his cover version of the song).