PHY_2130_ch9 - PHY 2130 Chapter 9: Fluids 10/31 (David...

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PHY 2130 Chapter 9: Fluids 10/31 (David Bowen) This version straightens out the P 1 -P 2 mixup on Slide 7
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10/31 PHY 2130, Class 26 2 States of Matter (9.1) Solids. Here we treat these as fixed shape and volume Liquids. Take shape from container. Here, treat as incompressible Gases. Expand to fill container. Compressible. Molecules far apart, virtually no interactions except for collisions
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10/31 PHY 2130, Class 26 3 Pressure (9.2) In liquids and gases, pressure surface (e.g. container) Due to molecular motion, bouncing elastically off of surface Pressure P ≡ F/A, unit is Pascal Pa = Nm -2 Atmospheric pressure: here, 1 atm ≡ 101.3 kPa o This is nominal, varies day to day, with weather o Decreases with increasing altitude Example: pressure on feet = mg/(2×9”×4”) ≈ 100 kg×9.8/(2×.23×.10) = 21.3 kPa θ θ
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The Silverdome stadium in Pontiac is approximately a circle with a radius of 110 m. Find the force of the atmosphere pressing down on the roof, in GN (1 GN = 10 9 N). 3.85 (F = AP = π × 110 2 × 101.3 × 10 3 for GN, divide by 10 9 ) 10/31 PHY 2130, Class 26 4 P = F/A Atmospheric pressure = 101.3 kPa
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10/31 PHY 2130, Class 26 5 Pascal’s Principle (9.3) In a confined fluid, pressure (changes)
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PHY_2130_ch9 - PHY 2130 Chapter 9: Fluids 10/31 (David...

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