Depends what you're trying to show. If it's pressure then yes it's Physics but I like the the collapsing can for that one as the students can do it. I use the exploding for combustion :P, a bit more explosive ^^.
Depends what you're trying to show. If it's pressure then yes it's Physics but I like the the collapsing can for that one as the students can do it. I use the exploding for combustion :P, a bit more explosive ^^.