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Take the transparent jar, fill it with water.
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Now with much care, place an egg inside the water.
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What happens, the egg sinks in water due to the heavy density of egg.
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Now take the egg out of the jar.
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Now, make the child to add 10 table spoons of water into the jar.
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Wait for some time, so that the salt dissolves in water.
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Ask the child whether the salt can be seen now in water.
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This is the dissolving property.
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Now place the egg inside the water.
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What happens. Now the egg floats.
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How does this happen. This is because the density of water increases after the salt is being added.