Lecture 6 09-02-11 - Pressure - Types of Pressures -...

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1 Pressure - Types of Pressures - manometer problems Temperature Scales temperature and temperature interval conversions Quiz on Unit Conversions The pressure exerted by seawater, or by any liquid at rest, is known as hydrostatic pressure . Hydrostatic Pressure depends on two principles depth density fluid fluid h g area force P ρ = gh P P o ρ + = Types of Pressures Atmospheric Pressure , P atm , is the pressure caused by the weight of the earth’s atmosphere. Often atmospheric pressure is called Barometric pressure Absolute Pressure , P abs , is the total pressure . An absolute pressure of 0 is a perfect vacuum . Absolute pressure must be used in all calculations unless a pressure difference is used. Gauge Pressure , P gauge , is pressure relative to atmospheric pressure. Vacuum is a gauge pressure that is a pressure below the atmospheric pressure. Absolute pressure , gauge pressure , and the atmospheric pressure are related by the following expression: P abs = P atm + P gauge The standard atmosphere is defined as the pressure
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Lecture 6 09-02-11 - Pressure - Types of Pressures -...

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