Clouds are water droplets formed from condensed water vapor that attaches to particles in the air. This activity requires simple materials, including a jar with a lid, hot water, ice and hairspray. First, pour hot water in the jar, then invert the lid atop the opening so that it holds a handful of ice cubes. Leave it undisturbed for around 20 seconds, during which time the vapor from the hot water will rise and condense into droplets when it reaches the cool lid. Remove the lid, spray hairspray into the jar, then replace the lid and watch the water droplets attach to the particles of hairspray, forming a small cloud.
After the activity, have a discussion with your students about the water cycle, conservation, how rain is made or weather in general.