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en.wikipedia.org/wiki/Limescale

Limescale is the hard, off-white, chalky deposit found in kettles, hot-water boilers and the inside of inadequately maintained hot-water central heating systems.

water.usgs.gov/edu/hardness.html

Dec 15, 2016 ... Hard water is high in dissolved minerals, both calcium and magnesium. ... When using hard water, more soap or detergent is needed to get ...

www.quora.com/Why-does-water-make-chewing-gum-hard

So if you have a piece of bubble gum in your mouth and you drink cold water, or you ... Source: Why does bubble gum get really hard if you put it in water?

extension.psu.edu/water-softening

Nov 9, 2017 ... For example, "hard water is what causes the white scale buildup on my ... you are not getting the maximum cleaning action from these products.

explorecuriocity.org/Explore/ArticleId/4232/why-is-that-when-we-add-water-to-a-dry-flour-it-gets-hard-4232.aspx

Feb 27, 2012 ... Many people have noticed that when you add water to flour it becomes harder. When you mix water and flour, it becomes a heterogenous ...

science.howstuffworks.com/environmental/earth/geophysics/manufacture-water.htm

For centuries, clean drinking water has been hard to come by for many ... and to do that we must have a sudden burst of energy to get these shy things to hook ...

www.popularmechanics.com/science/environment/a10893/expedited-explainer-hard-vs-soft-water-17008740

Jul 21, 2014 ... It's one of those small-talk conversations—almost like the weather—you can't get away from because water affects everything—namely, our ...

kidshealth.org/en/kids/water.html

All living things must have water to survive, whether they get it from a water ... If you're going to sports practice, a game, or just working out or playing hard, drink  ...

www.wired.com/2016/01/heres-how-hard-it-will-be-to-unpoison-flints-water

Jan 29, 2016 ... If the powers that be want to make Flint's water safe, they will have to ... 20,000 pipes and you get $60 million dollars—which suggests that the ...