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Last year, I dreamt I was pissing at a restroom, but I missed the urinal and my penis exploded.
Scientists aren't completely sure of the whole story. Several things are going on at once here. When a candle burns, it uses oxygen, which makes up about 20% of the gases in the air (most of the rest of the air is another gas called nitrogen). The flame goes out when all the oxygen has been used. The air pressure inside the glass is now a partial vacuum and is less than the air pressure outside. So the outside air pushes the water up into the glass. At the same time, the flame produces carbon dioxide and heats the air in the glass. Both of these increase the air pressure in the glass, so the rising water takes up less than the 20% of space you might expect when the oxygen is used up.
QuoteScientists aren't completely sure of the whole story. Several things are going on at once here. When a candle burns, it uses oxygen, which makes up about 20% of the gases in the air (most of the rest of the air is another gas called nitrogen). The flame goes out when all the oxygen has been used. The air pressure inside the glass is now a partial vacuum and is less than the air pressure outside. So the outside air pushes the water up into the glass. At the same time, the flame produces carbon dioxide and heats the air in the glass. Both of these increase the air pressure in the glass, so the rising water takes up less than the 20% of space you might expect when the oxygen is used up.
Or you could just use the candle to heat up the bowl or plate and it will break once hot enough if the water is warm or cold, not hot water obviously.