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新买来的烧水壶,用上一段时间后,水壶的内壁和壶底就会“长”出一层灰白色的水垢。水垢硬硬地紧贴壶壁,很难把它除去。大自然中,除了雨水以外,其他的水如井水、泉水、河水等,或多或少都含有叫碳酸氢钙的化学物质。含碳酸氢钙的水叫“硬水”。碳酸氢钙溶解在水里,人眼看不见。把硬水加热后,碳酸氢钙才会分解出来,生成细小的碳酸钙沉淀物。用水壶烧开水时,这些碳酸钙沉淀物就会附着在水壶壁上,久而久之,便形成了一层水垢。
Newly bought kettle, after a period of time, the inner wall of the kettle and the bottom will be “long ” a layer of gray scale. Scale hard and close to the pot wall, it is difficult to remove it. In nature, in addition to rain, other water such as well water, spring water, river water, more or less contains a chemical called calcium bicarbonate. Calcium bicarbonate water called “hard water”. Calcium bicarbonate dissolved in water, the human eye can not see. The hard water heating, calcium bicarbonate will be decomposed, the formation of small calcium carbonate precipitate. When boiling water with a kettle, these calcium carbonate deposits attach to the wall of the kettle over time and form a layer of scale.