空氣和水是各種工業部門取之不盡,最易取得而且分佈最廣的原料來源。很難找到一個不使用空氣、水或它們的組成原素的生產部門。然而,以空氣和水作為唯一的與直接的原料的乃是製造最重要的農業肥料——硝酸銨的部門。硝酸铵,是氮肥中的一種,是色白質脆的粉末,是各種农作物高額收穫量的泉源。它的成分是:最輕的元素——氫,地球上最多的元素——氧,和佔有大 Air and water are inexhaustible sources of various industrial sectors, the most accessible and widely distributed source of raw materials. It is difficult to find a production department that does not use air, water, or their constituent elements. However, the use of air and water as the sole and direct raw material is the sector that produces the most important agricultural fertilizer, ammonium nitrate. Ammonium nitrate, which is a kind of nitrogen fertilizer, is a brittle powder of white matter and is a source of high yield for various crops. Its composition is: The lightest element - hydrogen, the most abundant element on the earth - oxygen, and occupies large