The question was:
A burning candle is sitting in a liquid. It is then covered with a cylinder. Soon water moves into the cylinder as the candle burns out.
If you flip a glass or cylinder into water, no water can get into the glass because the air pressure from inside the glass pushes against the water. Suddenly, that force is weaker once the candle has burnt out. Why?
What is different now? Is there anything missing from the cylinder, allowing the water to move in?
Still stuck? Then click here.