# 10-5 Measurement of Pressure; Gauges and the Barometer - PowerPoint PPT Presentation

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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

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10-5 Measurement of Pressure; Gauges and the Barometer

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## 10-5 Measurement of Pressure;Gauges and the Barometer

Ptot= Po + rgh

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.

• rgh=(13.6 x 103 kg/m3 ) (9.80 m/s2 )(1.00x10-3 m)

• …so 1mm Hg = 133 N/m2

• 1 torr = 1 mmHg (Evangelista Torriceli1608-1647)

### 10-6 Buoyancy and Archimedes's Principle

• The story of Archimedes….

• Meanwhile, back in physics…

• Fb = rfgV

• 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