|| Heat & Temperature
| This exhibit demonstrates
that evaporation is a cooling process. A small amount of water is
squirted into an evacuated chamber. Because there is no air pressure
on the liquid, evaporation takes place at a much higher rate, sometimes
even boiling the water (at room temperature!!!) Since only the faster
molecules escape, leaving the slower ones behind, the liquid cools.
After about one minute, the water begins to freeze over. It is quite
a sight to see water boiling and freezing at the same time.