What causes atmospheric pressure to change

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11-6)What causes atmospheric pressure to change?
11-7)What is the relationship between atmospheric pressure and barometric pressure?
11-8)The reading on a low side pressure gauge is 65 psig. What is the absolute pressure?
11-9)Convert a chart reading of 100 psia to the reading you would see in gauge pressure.
11-10)Convert a barometric pressure reading of 26 inches Hg to psia.
11-11)Convert a reading of 20 inches HG vacuum to psia.
11-12)Define a vacuum and tell how it is measured.
11-13)Why are some liquid column pressures expressed in inches of water and others in inches of mercury?
11-14)What causes fluid pressure?
11-15)What is the pressure at the bottom of a square tank that has a cross section of 5ft2and is filled with water to a depth of 4ft? Only the depth is relevant.
11-16)What is the pressure in psi required to lift water 15 feet?
11-17)Explain how a simple open arm manometer measures pressure.
11-18)Explain how a bourdon tube gauge works.

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