Lecture_02_01_18_2012 - The Id l Gas L Th Ideal G Law Ron...

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The Ideal Gas Law Ron Reifenberger Birck Nanotechnology Center Purdue University January 18, 2012 Lecture 2 1
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Clapeyron 1834 Forerunners: Boyle 1662; Charles 1780s; Guy-Lussac 1802 Motivation: To systematically account for the diversity in the world, virtually all ancient cultures identify the same four basic elements: AIR , water, earth, fire our different kinds of materials) (four different kinds of materials) 2
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How to measure pressure of a gas? imple barometer Simple barometer vacuum o air) The pressure of air pushing down is strong enough to support a column of (no air) mercury that is 76 cm high. This defines the “standard atmosphere”. orce P = = force area M g A Mass M Density (13.6 x 10 3 kg/m 3 ) V g A A h g A h g = = = Area of be A 1 Stnd. Atm. = 1.013 x 10 5 Pa 100 kPa = 0.1 MPa tube A = 14.7 psi = 760 torr (1 Pa = 1 N/m 2 ) 3
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How does P and V of gas epend on T? vacuum o air) depend on T? h (no air) P = ρ gh V (volume) T (liquid bath); externally controlled 4
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- Data for Low Pressure Gas P V Data for Low Pressure Gas T must be measured in elvins!
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This note was uploaded on 02/05/2012 for the course PHYS 242 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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Lecture_02_01_18_2012 - The Id l Gas L Th Ideal G Law Ron...

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