Using a huge jar and with water colored with die in it you can make clouds. To do this set up the apparatus as shown in the video. Now open up the top valve and blow air into the jar. Now this causes the air inside to be compressed as we are pushing more air into the confined jar. This creates a high pressure inside the ball. To understand how clouds are formed you need to know two concepts. The first concept is that as pressurized gas expands it cools. The second thing is that warm gases can hold more water content than cold water. Since we make the gas cool off it releases some of the water in the form of little droplets which effectively will from the clouds. This video demonstrates how to make clouds in a laboratory.