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lecture04-pressure differences

# lecture04-pressure differences - So far Density average...

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So far … Density, average density, speciFc gravity pressure, p = ±/A, causes of pressure Pascal’s principle & gauge pressure today when to consider atmospheric pressure Hydraulic liCs think about buoyancy

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last class: U-tube Rank the pressures at points 1 to 5. (from GREATEST to smallest ) note: both ends open to air A. P 5 = P 1 > P 4 > P 2 = P 3 B. P 2 = P 3 > P 1 = P 4 > P 5 C. P 2 = P 3 > P 4 > P 1 = P 5 D. P 2 > P 3 > P 4 = P 1 > P 5 E. cannot determine without knowing the ρ unknown
The pressure is the same at all points on a horizontal line through a connected liquid ** in hydrostatic equilibrium. Hydrostatic equilibrium WHY is this TRUE? ** True IF the fluid has the SAME density throughout the pressure is caused by: à atmospheric pressure (P 0 ) à The weight of the liquid ** column above the horizontal line P 0 P 0

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weight & size P 0 P 0 at surface: feel equal ‘weight’ of air ( P 0 ) weight weight at this depth: feel equal weights of liquid (mg) Aluminium Lead ρ lead > ρ aluminium w lead = w aluminium EQUAL WEIGHT but you need a LOT more material of aluminum to have the same weight!
compare to manometer ρ gas > ρ atm compare the horizontal line where the density changes!

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lecture04-pressure differences - So far Density average...

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