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- Chemistry; Chem Sci/Eng
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- 硬水是含有較多可溶性鈣、鎂等化合物的水。所有自然的淡水中都多多少少含有鈣、鎂等礦物質的, 比方說如果水流過石灰, 硬度就會增加；而如果流過泥煤, 硬度就會下降。
维基百科 - by Han Li
- Example sentence(s)
- 所谓"硬水"是指水中所溶的矿物质成分多，尤其是钙和镁。硬水并不对健康造成直接危害，但是会给生活带来好多麻烦，比如用水器具上结水垢、肥皂和清洁剂的洗涤效率减低等。
- 东利网
 by Han Li - 钙镁离子含量较多的水称为硬水，钙镁离子含量较少的水称为软水。硬水与软水只是通俗上的叫法，并没有标准的量的概念，在生活中，行内一般把硬度低于3mmol/L的水称为较软的水，3-6称为普通水，6-8称为较硬的水，10以上称为高硬水。
- Supesite by Han Li
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