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Phase Change: Evaporation Cooling
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Phase Change:</strong> Evaporation Cooling</font>
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<td><font face="Verdana, Arial, Helvetica, sans-serif" size="4">Because of evaporation, any body of water is usually cooler than the air around it. Evaporation of sweat cools us on a hot day. In dry climates, you can cool your home with an evaporation unit. It is cool at the base of a waterfall. But why does evaporation cool?<br><br>
Evaporation involves a change or state, or phase, usually from liquid to gas, but sometimes from solid to gas. This page will provide an atomic-scale explanation for evaporation and its cooling effect.</font></td>
<td><img src="waterfall.gif" width="203" height="270"></td>
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<font size="5" color="#a65d2c" face="Verdana, Arial, Helvetica, sans-serif"><strong>What
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Run the following model for a while and observe the bar graph on the
right, which represents temperature of the system. Then press the "Remove
the cover. Let it evaporate" button and observe the change of the bar
graph.
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Remove the cover. Let it evaporate.
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>What do you
think cause the system to cool down when evaporation happens?</strong></font>
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