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水的硬度主要指溶解于水里的钙、镁盐含量。硬度通常又分为总硬度、暂时硬度和永久硬度。总硬度即一般所指的硬度,它为永久硬度与暂时硬度之和。暂时硬度又称碳酸盐硬度,这类硬度的水经加热煮沸,即可析出钙、镁的碳酸盐沉淀,而从水中除去。永久硬度又称为非碳酸盐硬度,在普通气压下加热煮沸,当体积不变时,它不生成沉积物,而保留在水中。硬度的升高就是指水里
The hardness of water mainly refers to the content of calcium and magnesium salts dissolved in water. Hardness is usually divided into total hardness, temporary hardness, and permanent hardness. The total hardness is generally referred to as the hardness, which is the sum of the permanent hardness and the temporary hardness. Temporary hardness, also known as carbonate hardness, this kind of hardness of the water boiled by heating, you can precipitate calcium and magnesium carbonate precipitation, and removed from the water. Permanent hardness, also called non-carbonate hardness, is heated and boiled under normal pressure. When the volume is constant, it does not form deposits but remains in water. Increase in hardness means water