Lecture 26 - Lecture 26 pls-26.1 Fluid Statics II Media 1 2...

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Lecture 26 pls-26.1 Fluid Statics II Media: 1. Hydraulics system 2. Buoyancy balance (w/ gooseneck camera) 3. Poly bottle 4. Large and small steel balls 5. Soda cans in water / salt water 1. Two Types of Pressure Gauges Both based on fact that pressure increases with depth: h g P P ρ + = 1 2 (i) Barometer (absolute pressure) Æ h g P atm = Æ g P h atm = . So that h is not too large, use a high density fluid, such as mercury (Hg), 3 10 6 . 13 × = kg/m 3 Æ () ( ) mm 760 m 0.76 m/s 9.8 kg/m 10 13.6 Pa 10 1.013 2 3 3 5 = = × × = = g P h atm . This is standard air pressure, but it is the small variations in the air pressure that are interesting because they are indicative of the weather. atm P P = 2 1 P = 0 h vacuum liquid
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Lecture 26 pls-26.2 (ii) open tube manometer (gauge pressure) h g P P atm ρ + = 2 Æ atm atm P P g P P h = 2 2 . atm P P 2 gauge pressure. E.g., this is what a tire pressure gauge measures.
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Lecture 26 - Lecture 26 pls-26.1 Fluid Statics II Media 1 2...

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