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scale (chemistry)
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Scale (chemistry)
In chemistry, calcium carbonate precipitates that form on the inside of a kettle or boiler as a result of boiling hard water (water containing concentrations of soluble calcium and magnesium salts). The salts present in hard water also precipitate out by reacting with soap molecules.
Scale may cause damage to water pipes and appliances such as washing machines and water boilers. The build-up of scale causes blockage of pipes, and electrical appliances have to use more electrical energy to operate efficiently.
© Research Machines plc 2008. All rights reserved. Helicon Publishing is a division of Research Machines plc.
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Switzerland Flag
The flag may have been based on that of Schwyz, one of the original cantons of the Confederation. While the national flag is square, a rectangular flag is used on Swiss lakes and rivers. Effective date: 12 December 1889.
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