How does 'fire cupping' work, and what's the Physics behind it? Answered
This is another unethically homework-based question.
I have to estimate the pressure inside the cup, but I don't get how low pressure is formed.
I am not sure that you can heat the air inside so much that the thing will suck in your skin immediately without giving you bad burns. Anyway, they put a match in it for a really short time...
The topic is Gas Laws, if it can help anyone.