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Why does salt water have a higher density than fresh water?

April 26, 2017density fresh Salt water

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Why does salt water have a higher density than fresh water?

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A molecule of water has the mass of the hydrogen and oxygen it contains. A salt water molecule also has the additional mass of the sodium and chlorine atoms dissolved in the water. Density is a measure of mass per volume, so the higher the mass, the higher will be the density.