1909, from German PH, introduced by S.P.L. Sörensen, from P, for German Potenz "potency, power" + H, symbol for the hydrogen ion that determines acidity or alkalinity.
ph
now in English usually representing "f," originally it was the combination used by Romans to represent Greek letter phi (cognate with Sanskrit -bh-, Germanic -b-), which at first was an aspirated "p," later the same sound as German -pf-. But by 2c. B.C.E. had become a simple sound made by blowing through the lips (bilabial spirant).
Roman "f," like modern English "f," was dentilabial; by c. 400, however, the sounds had become identical and in some Romanic languages (Italian, Spanish), -ph- regularly was replaced by -f-. This tendency took hold in Old French and Middle English, but with the revival of classical learning the words subsequently were altered back to -ph- (except fancy and fantastic), and due to zealousness in this some non-Greek words in -f- began to appear confusedly in -ph-, though these forms generally have not survived.
pH 英文释义
1. (chemistry) p(otential of) H(ydrogen); the logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per liter; provides a measure on a scale from 0 to 14 of the acidity or alkalinity of a solution (where 7 is neutral and greater than 7 is
pH 双语例句
1. Skin is naturally slightly acidic and has a pH of 5.5.
皮肤具有天然弱酸性，pH值为5.5。
来自柯林斯例句
2. A pH test measures the acidity or alkalinity of a substance.
pH值测试可检测物质的酸碱度。
来自柯林斯例句
3. a pH of 7.5
pH值7.5
来自《权威词典》
4. The fluid that emerges from the vents is acidic (pH 3) and hot.
从那些出口出来的液体呈酸性（pH值为3），且是热的。
来自柯林斯例句
5. pH is a measure of the concentration of free hydrogen atoms in a solution.
pH值是测试溶液中自由氢原子浓度的单位。
来自柯林斯例句
pH 实用场景例句
Skin is naturally slightly acidic and has a pH of 5.5.
皮肤具有天然弱酸性，pH值为5.5。
柯林斯例句
A pH test measures the acidity or alkalinity of a substance.
pH值测试可检测物质的酸碱度。
柯林斯例句
Pure water is neutral with a pH of 7.
纯水是中性的，酸碱度为7。
柯林斯例句
a pH of 7.5
pH值7.5
《牛津高阶英汉双解词典》
The fluid that emerges from the vents is acidic (pH 3) and hot.
从那些出口出来的液体呈酸性（pH值为3），且是热的。
柯林斯例句
pH is a measure of the concentration of free hydrogen atoms in a solution.
pH值是测试溶液中自由氢原子浓度的单位。
柯林斯例句
That man is a total phony, he palms himself off as a Ph . d.
那家伙是个彻彻底底的冒牌货, 他冒称是个博士.
《简明英汉词典》
You don't need a Ph.D to decode their work, but they do try to challenge audiences with unconventional material.
解读他们的作品并不需要有博士学位，但他们的确在尝试用一些非传统素材来挑战观众的接受度。
柯林斯例句
Hemagglutination of some viruses has a particular PH requirement.
某些病毒的血凝反应需要一定的PH值.
辞典例句
Such polyaggregates are stable only over very narrow temperature and pH regions.
这些多聚集体只有在非常窄的温度和pH范围内方是稳定的.
辞典例句
A solution which resists pH changes is known as a buffer solution.
能够阻止pH值变化的溶液称为缓冲溶液.
辞典例句
The inflection point at this PH is barely detectable.
在此PH值下,拐点不易发现.
辞典例句
Two Ph . D . theses attest to the results of his work.
有两篇哲学 博士 论文论证了他的研究结果.
辞典例句
He always drags his Ph . D . into every discussion.
