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Published byCameron Stafford Modified over 9 years ago
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How to get pure water from dirty water
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The water from ponds or rivers often looks quite dirty.
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It contains many impurities that are dissolved in the water. It also contains bacteria.
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Boiling the water in a kettle kills the bacteria, but it does not remove all of the impurities.
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When the kettle boils, the water turns into water vapour. This is invisible!
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The impurities are left behind in the kettle.
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As the water vapour cools, it condenses back into tiny droplets of water that form clouds of steam.
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The water vapour cools faster on cool surfaces such as mirrors or windows. We call it condensation.
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Here, condensation is forming on a flask full of iced water. It is dripping down into a glass.
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The water that collects is pure distilled water. It is safe to drink.
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