pH

Lemon juice tastes sour because it contains 5% to 6% citric acid and has a pH of 2.2. (high acidity)

Chart showing the variation of color of universal indicator paper with pH

In chemistry, pH (/piːˈeɪtʃ/) is a numeric scale used to specify the acidity or basicity (alkalinity) of an aqueous solution. It is roughly the negative of the logarithm to base 10 of the molar concentration, measured in units of moles per liter, of hydrogen ions. More precisely it is the negative of the logarithm to base 10 of the activity of the hydrogen ion. Solutions with a pH less than 7 are acidic and solutions with a pH greater than 7 are basic. Pure water is neutral, being neither an acid nor a base. Contrary to popular belief, the pH value can be less than 0 or greater than 14 for very strong acids and bases respectively.

词汇	P.H.
分类	英语词汇英语翻译词典
释义	P.H. 原声例句英文名大讲究 Whether you spell it with a " P-H" or an " F" , your baby girl's in good company. 不管你拼的是“P-H”还是一个“F”，你的宝贝女儿都会有很多好朋友。趣谈语言学 Words of Greek dissent were signified by adding an H after the C, as in chronicle and chaos, and substituting P-H for F, as in physics, phlegm, and pharmacy. 希腊语的异议词通过在 C 之后添加 H 来表示，如在 chronicle 和 chaos 中，并用 P-H 代替 F，如在 physics、phlegm 和 pharmacy 中。英语百科 pH In chemistry, pH (/piːˈeɪtʃ/) is a numeric scale used to specify the acidity or basicity (alkalinity) of an aqueous solution. It is roughly the negative of the logarithm to base 10 of the molar concentration, measured in units of moles per liter, of hydrogen ions. More precisely it is the negative of the logarithm to base 10 of the activity of the hydrogen ion. Solutions with a pH less than 7 are acidic and solutions with a pH greater than 7 are basic. Pure water is neutral, being neither an acid nor a base. Contrary to popular belief, the pH value can be less than 0 or greater than 14 for very strong acids and bases respectively.
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P.H.

pH