剑桥词典a number that shows how strongly acid or alkaline a substance is, in a range from 0 to 14 酸堿度，pH 值 Below pH 6.5 is acid , above pH 7.5 is alkaline. pH值低於6.5爲酸性，高於7.5爲堿性。 The soil in our garden has a low /high pH. 我們花園裡的土壤pH值較低／高。 返回 pH