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Delta P (ΔP), pressure difference or differential pressure usually refers in the technical world to the drop of pressure in a piping system, a heat exchanger or another machine, where a liquid is passing through.
The delta symbol Δ, is the fourth letter in the Greek and the Coptic alphabet. Delta / Δ is used as a mathematical symbol, which represents the „difference“ between two values.

ΔP stands for the difference between two measured pressure values. This can be measured either at different times/dates or at different positions in a system. The measurement at different times, can be a continuous measurement from day to day to see a trend as the ΔP develops over a longer period of time. Measurement at different positions in a system, i.e. you compare the pressure at the input with the pressure at the output of a machine. And get the pressure drop - Delta P.

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