开水瓶和水壶用过一段时间以后,壁上会粘附着一层灰白色物质,这就是水垢。水垢是水中杂质在受热以后分解沉淀下来的,其主要成分是钙,亦有钾、钠等其他元素。有些人担心水垢给人体带来的危害,特别是尿结石患者,总认为自己患疾是水垢所致,担心喝了水垢严重的水,日后又会得尿结石。其实大可不必担心,水垢与尿结石并无关系。这是为什么呢? After a bottle of water and a kettle have been used for a period of time, there will be a layer of gray-white material on the wall. This is called scale. Scale is the impurity of water that decomposes and precipitates when it is heated. Its main component is calcium, but also other elements such as potassium and sodium. Some people are worried that the scale will cause harm to the human body. In particular, patients with urinary stones always think that their illness is caused by scale. They are worried that they may drink water with severe scale and they will get urinary stones in the future. In fact, there is no need to worry, scale and urinary stones have nothing to do. Why is this?