Experiment: Homemade Clouds
Put just enough water into the jar to cover the bottom.
Put the glove into the jar, pointing the fingers down. Stretch the glove opening over the jar’s mouth.
Put your hand carefully into the glove, making sure not to dislodge it. Quickly pull your gloved hand out of the jar, keeping the seal intact.
Take the glove off the jar’s mouth and drop a lit match into the container.
Quickly replace the glove over the jar, sealing the opening again.
Replace your hand into the glove and pull it outward.
Clouds should form when you pull the glove outward the second time, and go away again when you put your hand back into the jar. There are water particles within the air. When you pull out the glove, you are making more room inside the jar, giving the air more room to expand. The water particles cool when this happens, and when that happens, they stick to each other, forming clouds. The match provides smoke, which just helps water particles cluster more easily. When you put your hand and the glove back inside the jar, you force air to compress into less space, heating the air up.