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Question

Rita was conducting an experiment . She has  a plate containing some water. In which place she has put a lit candle stick. Then she covers the candle stick with the glass so that the candlesticks drops burning. After this she sees  that the water in the plate has gone into the glass. Why did the water move into the glass?


Solution

At first, the flame heats the air inside the container and this hot air expands quickly. Some of the expanding air escapes from under the vase where you might have seen some bubbles. When the flame fades and goes out, the air in the container cools and cooler air contracts or takes up less space. That contraction creates a weak vacuum – or lower pressure – in the container. Where’s the higher pressure? Right! It’s outside the container pressing down on the water in the dish. The outside air pushes water into the container until the pressure is equalized inside and outside the container. The water stops rising when that pressure equalization is reached.

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