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水係一種氫氧化合物嗰俗稱,學名叫氧化二氫,純水只含單一種分子,由兩隻氫原子同到一隻氧原子合成。化學方程式應該表達成H2O。
地球超過百分之七十表面拕水覆蓋,箇中地方叫海洋。水分為淡水同到鹹水,鹹水即係偶俚話嗰海水,佔全球嗰97.5%,而淡水有2.5%。冰佔到淡水2.5%嗰1.7%,故係偶係用到嗰淡水係少之又少。淡水係其中一種全世界都爭嗰自然資源之一,多水就叫澇,少水就叫旱。
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