lecture5 - Lecture 5(Feb 6 • Pressure in liquids and...

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Unformatted text preview: Lecture 5 (Feb. 6) • Pressure in liquids and gases • Measuring and using pressure • Archimedes’ principle (foat or sink?) Pressure • Measuring device: fuid pushes against “spring”, deduce Force From displacement • Pressure exists at all points, not just walls (like tension in string) • Pressure is same in all directions at a point • Pressure increases with depth in liquid ( not in gas) p = F A (SI units: 1 N/m 2 ≡ 1 Pa ) master Formula Causes of Pressure • Difference in pressure between liquids and gases due to (in)compressibility • compare 2 jars containing mercury liquid and gas: without gravity (outer space) and with gravity • 2 contributions to pressure: (i) Gravitational : Fuid pulled down, exerts forces on bottom and side (ii) Thermal : collisions of gas molecules with walls Pressure in Gases • For lab.-size container, gravitational contribution negligible pressure is same at all points • increases with density (more collisions with wall) Atmospheric pressure...
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This note was uploaded on 04/09/2008 for the course PHYS 260 taught by Professor Chen during the Spring '08 term at Maryland.

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lecture5 - Lecture 5(Feb 6 • Pressure in liquids and...

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