2007/10/06 日記<軟水>
軟水
軟水(なんすい)は、カルシウムやマグネシウムのイオン含有量が少ない水。工業用水にむき、飲む|飲用、炊飯にも適す。日本では、カルシウムとマグネシウムの量がリットル当たり178mg未満(硬度 (水)|硬度178)の水をいう。軟水は金属石けん(石けんカス)が出来にくい。硬度60の水と硬度1の水では、石けんを溶かす能力に2倍の差がある。
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