ph

英美['pi 'etʃ]

abbr. 酸碱度符号（描述氢离子活度的）

常用词汇低频词

英英释义

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

考试真题

Jody has a Ph.D.in nutrition, but more important, she has personal experience—her mother taught her to diet when she was only eight years old.

Jody has a Ph.D. in nutrition, but more important, she has personal experience—her mother taught her to diet when she was only eight years old.

There are more than 600,000 professional social workers in the country, and we all either have a bachelor’s degree, a master’s degree or a Ph D in social work.

There was a time not long ago when new science Ph.

Partly this is a result of how bleak the academic job market is, but there's also a rising awareness of career options that Ph

One critical step that could help to drive change would be to require Ph.

In science, graduate students and new Ph

What do we learn about new science Ph.

What does the author say about America's 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。

A pH test measures the acidity or alkalinity of a substance.: pH值测试可检测物质的酸碱度。

Pure water is neutral with a pH of 7.: 纯水是中性的，酸碱度为7。

a pH of 7.5: pH值7.5

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。

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。

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.

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。

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.

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.

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.

The inflection point at this PH is barely detectable.: 在此PH值下,拐点不易发现.

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.

He always drags his Ph . D . into every discussion.: 他讨论发言的时候总是要生拉硬扯到他的哲学博士头衔.

A buffer system resists a change in pH.: 缓冲系统对pH的变化是有耐受能力的.

中文词源

pH 酸碱值

来自德语pH,来自Potenz,能力，力量，词源同potent,H,氢离子，缩写自hydrogen ion.

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。

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。

3. a pH of 7.5: pH值7.5

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。

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。

英文词源

pH: 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

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