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Question:

Ignite a piece of paper, put it in a bottle, wait for paper to burn, and immediately seal it with rubber,

Ignite a piece of paper, put it in a bottle, etc., and burn it immediately. Use a rubber to seal it. What about your mouth? Is it concave or convex?

Answer:

The mouth will protrude. When oxygen is exhausted, the combustion will end and the temperature will fall to normal temperature and flatten again
From the angle of expansion and contraction, the combustion heat release makes the gas temperature rise and expand
The first floor is not right. Although it consumes oxygen, it also produces carbon dioxide. It is not convex and concave from the point of view of gas consumption

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