thermal_2_01_19_2011

thermal_2_01_19_2011 - The Ideal Gas Law Clapeyron 1834...

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The Ideal Gas Law Clapeyron 1834 Forerunners: Boyle 1662 Charles 1780s Guy-Lussac 1802 Lecture 2 WHY? – To systematically account for the diversity in the world, virtually all ancient cultures identify the same four basic elements: AIR, water, earth, fire (four different kinds of materials)
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How to measure pressure of a gas? Simple barometer vacuum (no air) The pressure of air pushing down is strong enough to support a column of mercury that is 76 cm high. This defines the “standard atmosphere”. P = = force rea M g area A Mass M Density ρ (13.6 x 10 3 kg/m 3 ) Area of tube A 1 Stnd. Atm. = 1.013 x 10 5 Pa 100 kPa = 0.1 MPa = 14.7 psi = 760 torr ρ V g A ρ A h g A ρ h g = = = (1 Pa = 1 N/m 2 )
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How does P and V of gas depend on T? P = ρgh vacuum (no air) V (volume) T (liquid bath); externally controlled
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Analysis of Data Shows T must be measured in Kelvins! T
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thermal_2_01_19_2011 - The Ideal Gas Law Clapeyron 1834...

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