剑桥词典a number that shows how strongly acid or alkaline a substance is, in a range from 0 to 14 酸碱度，pH 值 Below pH 6.5 is acid , above pH 7.5 is alkaline. pH值低于6.5为酸性，高于7.5为碱性。 The soil in our garden has a low /high pH. 我们花园里的土壤pH值较低／高。 返回 pH