Mummy. What is the steam coming from the pot made of?
I think you can figure this out. What does it look like?
Fog. It looks like fog.
Great – what is fog made out of?
Clouds. Fog is like low clouds.
Excellent. What are clouds made out of?
Rain. Clouds are made of rain, and rain is made of water. STEAM IS MADE OF WATER!
Whither Earthlings 