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The salt in the water does this.

Consider a glass of water filled up to a line on the glass. Then add 3 teaspoons of salt to that glass of water and stir until the salt dissolves. You will find that despite the addition of the salt the water still only comes up to the line.

What has happened is that the salt has gone into solution in the water and the mass of the salt is now part of (inside) the water - the density of the solution has increased.

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11y ago

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