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vapor pressure
Posted by Erik (more from Erik) on Thu, 22 Dec 2005 09:33:00
In Reply to: Relieving cooling system pressure / Boyle's Law?, 94.9000.cse.t, Thu, 22 Dec 2005 08:57:24
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Vapor pressure is the pressure exerted by the vapor from a liquid and is specific for each given temperature. As the temp goes up, the vapor pressure goes up. For water, the vapor pressure at 100 degrees C is 1 atmosphere, so it boils at 100 degrees C. Vapor pressure is lowered by the addition of a solute, as well as for solutions of miscible (freely mixable) liquids, such as water and ethylene glycol. This raises the boiling point.
The pressure in the system is from the vapor pressure exerted by the solution of water and ethylene glycol, and very little of it by heating of the air within the system.
posted by 216.165.143...
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