10-5 Measurement of Pressure; Gauges and the Barometer P tot = P o + r gh Gauges and measuring devices that measure pressure often compare the pressure.

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Presentation transcript:

10-5 Measurement of Pressure; Gauges and the Barometer P tot = P o + r gh Gauges and measuring devices that measure pressure often compare the pressure of a contained space to that of the atmosphere. See page 280 diagrams A mercury barometer uses the height of a column of mercury to measure atmospheric pressure. A manometer does much the same, but with a sealed container for vapor pressure.

r gh=(13.6 x 10 3 kg/m 3 ) (9.80 m/s 2 )(1.00x10 -3 m) …so 1mm Hg = 133 N/m 2 1 torr = 1 mmHg (Evangelista Torriceli )

10-6 Buoyancy and Archimedes's Principle The story of Archimedes…. Meanwhile, back in physics… F b = r f gV Archimedes’ principle…the buoyant force on a body immersed in a fluid is equal to the weight of the fluid displaced by that object. See example 10-5 and Holt example 9- See example 10-6 and 10-9 Giancoli.

Homework Giancoli p 304 pr#12-#15 and #21-#24 due Monday BOP

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