in the presence of your teacher, fix two small candle of the same size in the middle of two shallow containers. Now fill the containers with some water. Light the candies and then cover each one of them with an inverted glass (one much taller than the other)
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Air is a mixture of several gases. It contains 78% nitrogen, 21% oxygen, about 0.9% argon and other noble gases, 0.03% carbon dioxide, traces of other gases and water vapour.
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