Okay, I'll try to explain about the experiment : "removing
coin from the water without getting your hands wet"
So, when the paper burnt, carbon and oxygen in the air turn
into carbon dioxide.
And then the gas pressure inside the water cup will drop.
Then continue to expand while the burning phase and shrink
while the cooling phase.
And the pressure making the water rise inside the water cup.
So that's how you remove a coin from the water without
getting your hands wet.
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