Which evaporates quicker-a swimming pool sitting still or a pool circulating (100 degree / 105 heat index)?

Answer 1

If a pool is still, the water will stratify with the warmest water at the surface, especially on a hot (100F?) day. The warmer the water is the less additional heat must be added to evaporate it. Water molecules are constantly leaving and re-entering the water surface during evaporation but the net effect is loss of water unless the humidity is 100%. Circulating the water will equalize the temperature and lower the surface water temperature reducing evaporation. The water temperature as measured using a thermometer is actually an average temperature of the water wetting the bulb. Some water molecules are vibrating more or less depending on their instantaneous energy received in collisions with other molecules. The most energetic molecules have enough energy to escape the surface tension of the water and float away in the air. The more energy the molecule collects the better.

Answer 2

The circulating pool evaporates quicker. It has a larger surface area and the water is being turned over so the cooler water at the bottom comes to the top and is warmed faster than if the pool was static.

Answer 3

Hi. Evaporation occurs at the surface so anything that makes the surface have a greater area increases the evaporation. Hope this helps.

Answer 4

Any body of liquid that is in motion will more rapidly change states.