Cloud in a Jar

What you need:

A Jar, some ice, hot water and hairspray

Step one: Fill half of the jar with boiling water. Then place the bottom of the cap on the jar.

Step 1: Step 2 (hot and Cold)

Put ice on top of the jar and wait for 20 seconds.

Step 2: Step 3 (Hairspray)

Quick spray with hairspray and recover.

Step 3: Step 4 (Clouds)

Watch clouds form.