Thursday, 11 June 2009

The important thing to recognize is that condensation can pull a vacuum. The vacuum can be substantial if all the air is removed from the vessel before condensation. If air is completely removed and the vapor is condensed, the final pressure will be the vapor pressure of water. At 25C, this is 0.032 bar, 24 mm Hg, or 29.0 inches of vacuum!

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