Light your match
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Put a little water in the bottle, light a match, and once it starts burning, put it into the bottle and cover it immediately. Then the question arises: when will negative pressure be created in the bottle? Analyze the reasons,
A match needs oxygen to ignite; as oxygen is consumed and its volume decreases, a negative pressure is created.
Does a match still not go out when it comes into contact with water? Is there still a lack of oxygen?
Negative pressure will be created when it is placed in the bottle. Since combustion consumes air, the air pressure in the combustion area is low, and air flow is needed to replenish it.
Does the smoke produced by burning matches help replenish the oxygen that is consumed?
Once it is placed in the bottle and the oxygen inside is consumed, negative pressure begins to develop
What I observed was that there was no obvious change in the bottle while the match was burning; however, as the burning weakened and the match was about to go out, the bottle began to shrink. Could it be that the heat generated by combustion increased the internal pressure?
Exactly how to perform a flow field simulation?
When a match burns, it consumes one volume of oxygen and produces one volume of carbon dioxide; this creates negative pressure inside the bottle. This is likely due to poor airtightness of the bottle – as the gas heats up, its volume expands and some of it escapes, while when the temperature drops, its volume contracts.
“...It’s probably because the seal of the bottle isn’t tight; when heated, the gas expands and some of it escapes, and when the temperature drops, the gas contracts again... If the gas expands when heated and can escape, then why can’t it return when it contracts? A one-way valve?