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Yes. Now let me figure out which way it goes... Salt lowers the vapor pressure because it takes up space at the surface, thus impeding the escape of water molecules, without impeding the collection of water molecules from the surroundings. Under sufficiently high humidity conditions and sufficiently high salt concentrations, the salt water will gain water from the atmosphere, i.e. a negative evaporation rate. Turns out that without this phenomenon, rain would be exceedingly rare, because it would be well nigh impossible for a cloud droplet to form, requiring highly supersaturated air before the first droplet formed. But once it did, it would be a doozy. But don't trust me. This sounds like a really good kitchen counter experiment. A couple of plastic cups, a ruler, a few tablespoons of salt, maybe some sugar or baking soda, and some water. Have fun with it. Report your results here.

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โˆ™ 2008-04-13 19:40:01
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Q: Does adding something to a jar of water like salt baking soda or sugar affect the evaporation rate?
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