Volume Question

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Smart $ said:
Correct... if there were still water in liquid state, or to begin with, within the container. The question as posed implies there is no liquid water in the container and no change of content or state (i.e. no history).
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All that I saw was water at 220F and one atmosphere pressure, which did not state that there was no liquid water. If the system were in stable equilibrium with liquid water present the pressure would have to be greater than one atmosphere.
Superheated steam is at a temperature higher than 212F but also usually at a higher pressure. I agree that is not necessarily true though.

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GoldDigger said:
All that I saw was water at 220F and one atmosphere pressure, which did not state that there was no liquid water. If the system were in stable equilibrium with liquid water present the pressure would have to be greater than one atmosphere.
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Correct.

Superheated steam is at a temperature higher than 212F but also usually at a higher pressure. I agree that is not necessarily true though.
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You could technically have steam and water in the same [closed] system at 1atm and 212?F, but not when the entire system has a temperature higher than 212?F. The pressure would have to be greater than 1atm to have both. BTW, this type of steam is more commonly referred to as saturated steam.
 
mgookin said:
It depends on how much altitude. Gravity changes with altitude which changes the weight but not the mass.
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True. But for most practical purposes (meaning earth bound) it changes very little. Doing a rough calculation, an object 1 mile above earth's mean radius is just 0.05% lighter. Of course the change in weight is not linear, but to change even 1% would require approximately a 216 mile elevation.
 
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