pHBrE/ˌpiː ˈeɪtʃ/NAmE/ˌpiː ˈeɪtʃ/noun[sing.] (chemistry化学) ameasurementofthelevelofacidoralkali in a solution range of 0 to 14 a reading of below 7 shows an acid and of above 7 shows an orsubstance. InthepHrangeof0to14areadingofbelow7showsanacidandofabove7showsanalkali. * pH 值（溶液或物质的酸碱度。pH 值介于 0 至 14，7 以下为酸，7 以上为碱）◆apHof7.5pH 值 7.5◆totestthepHlevelofthesoil测试土壤的酸碱度