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pH值是化学上的一个基本概念,是用来量度水溶液中氢离子的浓度(即氢离子浓度的负对数值)的。常温下pH值为7表明水溶液呈中性,大于7呈碱性。小于7呈酸性。pH值作为化学上最常测定的数值之一,其应用极其广泛,它是与所有生物有着基本关系的表示符号。
pH is a basic chemical concept used to measure the concentration of hydrogen ions in aqueous solution (ie, the negative logarithm of hydrogen ion concentration). At room temperature pH 7 indicates that the aqueous solution was neutral, greater than 7 was alkaline. Less than 7 was acidic. As one of the most commonly measured chemistries, pH is extremely versatile and represents the fundamental relationship that all organisms have.