The soda can crumpled in on itself. When you heat it up, it causes the air temperature & pressure inside the can to rise. When the air inside the can was put into the cool ice bucket, the air cooled and caused the pressure inside the can to decrease. As the pressure on the inside walls of the can decreased, the walls of the can collapsed since there wasn't enough air pressure inside the can to offset the air pressure on the outside of the can.
For the Egg Activity you need: a shelled hard-boiled egg, an empty glass frappucino bottle, a peice of paper and a match.
I predict that the egg is going to be sucked into the bottle.
What actually happened: I was right.When we lit a fire in the bottle, the air in the bottle became much warmer. The air expanded as it got warmer and warmer and it was crowded in there for the air. Then the flame burns out. As the air inside the bottle began to cool off, it also shrank in size again. The air pressure inside of the bottle was reduced. So, the air pressure outside of the bottle and on top of the egg was greater than the air pressure inside the bottle. The air pressure from outside the bottle pressed and pushed the egg down the bottle.
When we got egg back out again: When we blew and forced air back into the bottle, we increased the air pressure inside the bottle. So, the air was pushing and shoving the egg to get out of the bottle. We saw just the opposite thing happen with air pressure when we made the egg drop into the bottle. When there is air pressure, the air is shoving and pushing things around and in it.
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