Amazing Cloud Demonstration

This dramatic demonstration shows students why meteorologists spend so much time talking about areas of high and low pressure. It helps students understand the relationship between rising air, low pressure, expansion, cooling below the dew point, and cloud formation.

BE CAREFUL! If you are not comfortable using rubbing alcohol, fill the jar with hot water and let it set for 10 minutes, then dump almost all of the water out. This will provide air that is humid enough (in the jar) to do the demonstration for several minutes. I like to use rubbing alcohol because I can do the demo all day without messing with filling and emptying the jar with hot water 5 times during the day.