Chapter 3.1 Pressure Presentation

7/31/2019 Chapter 3.1 Pressure Presentation

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P = F/A


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Mass of liquid = Ahp P = pgh


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Pressure in liquid does not depends on

- the of the container.- the of the container.- the of its surface


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Pa = 0cmHgPb = 26cmHgPe = 76cmHgPf= 84 cmHg


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Figure shows a simplebarometer. Find theatmospheric pressure in theunit of cmHg

The atmospheric pressure,P = 76cmHg


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Pgas = Patm + PliquidPgas = Patm + hg

Pgas

= Gas PressurePatm = Atmospheric Pressureg = Gravitational Field Strength


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Figure shows a column ofmercury in a glass tube. Some airis trapped in the glass tube. If theatmospheric pressure is 76cmHg,what is the pressure of the gasinside the tube?

Patm = Pair + Pmercury(76) = Pair + 50Pair= 76 - 50 = 26cmHg


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Chapter 3.1 Pressure Presentation