Question

During which step in the Can Crush Lab did water vapor condense inside the can?

Answer 1

So think about condensing for a minute.

That water on the outside of a cold glass is condensation. Same thing with steam and a boiling pot of water with a lid. You take the lid off and the steam condenses on it.

If the can has water in it, or residual water, then the answer is the 2nd option. I'm assuming it is that because of the word heat, which can cause steam when the water heats up.