A measure of the acidity or alkalinity of a solution, numerically equal to7 for neutral solutions, increasing with increasing alkalinity and decreasing with increasing acidity. The pH scale commonly in use ranges from0 to14.

• 酸碱度溶液酸性或碱性的度量，数值等于7的为中性溶液，数值增大表示碱性增大，数值减小表示酸性的增大。PH值范围一般在0到14之间