What is "hard water", and why does "hard water" leave more deposits in hot water pipes than in cold water pipes?

What is "hard water", and why does "hard water" leave more deposits in hot water pipes than in cold water pipes?

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"Hard" water is water with lots of dissolved minerals, specifically calcium and magnesium. Hard water is not a health risk, but a nuisance because these minerals build up and are left behind.

This is because it is easy to dissolve things in water: water, in other words, is a good solvent, and therefore picks up impurities easily. Pure water -- tasteless, colorless, and odorless -- is often...

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It is water which has a high mineral content, consisting of dissolved minerals, ranging from calcium and magnesium ions present in it, but it proves to become a nuisance as it damages the water pipes by scaling and corroding the pipes it come into contact with. Water that contains a pH value of above 7 is known as hard. Heating water seperates the water from the dissolved minerals are left behind as sediments or deposits, so hard water that was being heated contributes to the deposition of more minerals in hot water pipes than cold water pipes, given the above point.