sup1203_2

sup1203_2 - Important Comments on Phase Transitions On...

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Important Comments on Phase Transitions On Friday 12/3/99 we discussed in lectures Phase Transitions.The 11 AM lecture will be shown on PIVoT. The Ideal Gas Law ONLY holds (approximately) when you have ONLY gas.WHENEVER THERE IS ANY LIQUID PRESENT, THE GAS LAW CANNOT BE USED. During the 11 AM lecture, near 11:45 AM, I said that the pressure inside the paint can will never make it to 17 mm Hg as the volume of the can decreased (the can imploded). That is incorrect. If there were no air in the can left when I closed it, in other words, if all air had been replaced by water vapor (gas) of 100 C (due to the boiling water in the can), then the pressure inside the can should go down all the way to about 17 mm Hg (about 1/45 of an atmosphere) as the water gas/vapor inside the can cooled to room temperature of 20 C. The fact that the can imploded, (the volume decreased), makes NO difference. Inside the can is liquid water and water vapor. They co-exist and they are in thermal equilibrium (i.e. they have the same temperature). This means that as
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This note was uploaded on 11/20/2011 for the course PHY 203 taught by Professor Staff during the Fall '09 term at Rutgers.

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sup1203_2 - Important Comments on Phase Transitions On...

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