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Unformatted text preview: ChE 210: Meeting 4 January 19, 2011 Outline (F&R Sections 3.4-3.5) Homework Due Friday 01/21/2011
- Quiz 2.1, 2.2, 2.8, 2.9, 2.25, 2.31, 3.3
- Hydrostatic Pressure & Fluid
Head - Atmospheric, Absolute and
Gauge Pressure - Measurement of Fluid
Pressure - Temperature Hydrostatic Pressure & Fluid Head pressure (P) = ———:::
Units of pressure: SI = mm 1
C93 = Mi 2‘ AE = i , 1U." ‘
1 force needed on frictionless plug fluid pressure =
area of hole hydrostatic pressure = pressure of fluid at base of column Pbase = P0 + Pfluid 1/5 ChE 210: Meeting 4 January 19, 2011 ShOW Pﬂuid = f i it“)
Head of fluid = the height of a hypothetical column of fluid that exerts a given pressure at the base of a column if the pressure at the top of the fluid were ZGI'O. 2/5 \ l w ‘\ ,.‘ .y ChE 210: Meeting 4 January 19, 2011 Atmospheric, Absolute and Gauge Pressure _
Atmospheric pressure is the pressure at the base of a column when P0 is zero and the density and gravity are average values between the top of the atmosphere and the base of the column. w Patm =7? h Absolute pressure is defined such that zerois a perfect vacuum. Gauge pressure is measured relative to atmospheric pressure. F’abs = Patm + Pgauge If a watch has a water resistancy rating of 50.0 [m], how much pressure [atm] can it withstand? ‘ 3/‘5 J ...
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