CH E 312 Lecture 6 - We learned P = P(z dP =-gdz For...

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1 P = P(z) dP = - ρ gdz For incompressible fluids ( ρ = constant): z x y We learned... P atm h P = P atm + ρ gh
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2 We learned... P = P atm + ρ gh Density ρ P 1 = P 2 = P 3 1 2 3 Hydrostatic Pressure
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3 2.4 Pressure Measurement The pressure at a point within a fluid will be either an absolute pressure or a gage pressure. Absolute pressure is measured relative to a perfect vacuum (absolute zero pressure), Gage pressure is measured relative to the local atmospheric pressure. 𝑃𝑃 𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 = 𝑃𝑃 𝑔𝑔𝑎𝑎𝑎𝑎 − 𝑃𝑃 𝑔𝑔𝑎𝑎𝑎𝑎
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4 2.4 Pressure Measurement A gage pressure of zero corresponds to a pressure that is equal to the local atmospheric pressure. Absolute pressures are always positive, but gage pressures can be either positive or negative depending on whether the pressure is above atmospheric pressure (positive value) or below atmospheric pressure (negative value). A negative gage pressure is also referred to as a suction or vacuum pressure.
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