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No, salt water does not evaporate faster than tap water. The evaporation of water is slower when molecules are dissolved in the water. Sea water is very salty and so will evaporate more slowly than tap water or pure water.

If you have a very small amount of salt dissolved in water, then it has a small effect on evaporation. Tap water has a very small amount of salt and other things dissolved in it, but that also varies enormously depending on where the tap water comes from.

The rate of evaporation also depends on considerations other than whether there something dissolved in the water, but as a rule of thumb, the more material dissolved in the water the slower the evaporation. This could easily be demonstrated in a science experiment by dissolving varying amounts of salt and then waiting for several days or weeks. One would have to assure that temperature and wind currents were the same for all samples tested. (Note that as water evaporates, salt will become encrusted on the exposed sides of the container and that will alter the concentration of the remaining salt, so appropriate accommodations in the design of the experiment will be needed if more quantitative measures are desired.)

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9y ago

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