কঠিনকঠিন হ
কঠিন পানী (Assamese) [ Roman: ko.thin pa.ni]
Contributed by: Bikram M Baruah on 2008-11-15
1. (Material Noun-Neuter) Water that has high mineral content (in contrast with soft water). Hard water minerals primarily consist of calcium (Ca2+), and magnesium (Mg2+) metal cations, and sometimes other dissolved compounds such as bicarbonates and sulfates.