**Pressure drop** is defined as the difference in pressure between two points of a fluid carrying network. Pressure drop occurs with frictional forces, caused by the resistance to flow, on a fluid as it flows through the tube. The main determinants of resistance to fluid flow are fluid velocity through the pipe and fluid viscosity. Pressure drop increases proportional to the frictional shear forces within the piping network. A piping network containing a high relative roughness rating as well as many pipe fittings and joints, tube convergence, divergence, turns, surface roughness and other physical properties will affect the pressure drop. High flow velocities and / or high fluid viscosities result in a larger pressure drop across a section of pipe or a valve or elbow. Low velocity will result in lower or no pressure drop.

Read more about Pressure Drop: Calculation, See Also

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### Famous quotes containing the words drop and/or pressure:

“Misfortunes leave wounds which bleed *drop* by *drop* even in sleep; thus little by little they train man by force and dispose him to wisdom in spite of himself. Man must learn to think of himself as a limited and dependent being; and only suffering teaches him this.”

—Simone Weil (1909–1943)

“This is a catastrophic universe, always; and subject to sudden reversals, upheavals, changes, cataclysms, with joy never anything but the song of substance under *pressure* forced into new forms and shapes.”

—Doris Lessing (b. 1919)