1. In a still room, smoke from a candle will sometimes rise only so far, not reaching the ceiling. Discuss. 2. After boiling a bit of water in a gallon can and then sealing the can when water vapor...

1. In a still room, smoke from a candle will sometimes rise only so far, not reaching the ceiling. Discuss.

2. After boiling a bit of water in a gallon can and then sealing the can when water vapor has driven out most of the air, Dan Johnson and his class watch the can slowly crumple. Discuss the role of condensation of water vapor inside the can. What does the crumpling?