| 单词 | pH value |
| 释义 | pH /pē-āchˈ/ or pH value /valˈū/nounA number used to express degrees of acidity or alkalinity in solutions, formerly the logarithm to base 10 of the reciprocal of the concentration of hydrogen ions, but now related by formula to a standard solution of potassium hydrogen phthalate, which has value 4 at 15ºC ORIGIN: From Ger Potenz power, and H the symbol for hydrogen |
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