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0108 Notes

0108 Notes - Pdeep = Pshallow gh Tools that Use Effects of...

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1/8/10 Oregon State University PH 202, Lecture 3 1 P deep = P shallow + ± gh Tools that Use Effects of Static Fluid Pressure Pressure at depth: ± Pressure gauges ± Drinking straws and barometers Pascal’s Principle: ± Hydraulics Archimedes’ Principle: ± All fl otation devices

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1/8/10 Oregon State University PH 202, Lecture 3 2 Pressure Gauges Static pressure varies directly with the depth in an incompressible fl uid (no matter the shape of the container). This makes it very handy to use in a pressure gauge , which measures pressure differences between two points, as indicated by a column of fl uid. Most gauges measure pressure against the most convenient reference—atmospheric pressure: P abs. = P gauge + P atm. or: P P gauge = P atm. (If you don’t see the word “gauge” used, you may assume the pressure indicated is absolute pressure.)
1/8/10 Oregon State University PH 202, Lecture 3 3 Drinking Straws and Barometers There is no such thing as “suction.” You cannot effectively move much fl uid by “pulling” on it—you can only push on it.

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