ph

¹ American  

Optics.

1. phot; phots.

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pH ² American  

Chemistry.

1. the symbol for the logarithm of the reciprocal of hydrogen ion concentration in gram atoms per liter, used to express the acidity or alkalinity of a solution on a scale of 0 to 14, where less than 7 represents acidity, 7 neutrality, and more than 7 alkalinity.

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Ph ³ American  

abbreviation

Chemistry.

1. phenyl.

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ph. ⁴ American  

abbreviation

1. phase.

2. phone.

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P.H. ⁵ American  

abbreviation

1. Public Health.

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pH ¹ British  

noun

1. potential of hydrogen; a measure of the acidity or alkalinity of a solution equal to the common logarithm of the reciprocal of the concentration of hydrogen ions in moles per cubic decimetre of solution. Pure water has a pH of 7, acid solutions have a pH less than 7, and alkaline solutions a pH greater than 7

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ph ² British  

abbreviation

1. Philippines

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ph. ³ British  

abbreviation

1. phase

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Ph ⁴ British  

symbol

1. phenyl group or radical

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pH Scientific  

/ pē′āch′ /

1. A numerical measure of the acidity or alkalinity of a solution, usually measured on a scale of 0 to 14. Neutral solutions (such as pure water) have a pH of 7, acidic solutions have a pH lower than 7, and alkaline solutions have a pH higher than 7. The pH of lemon juice is 2.4; that of household ammonia is 11.5. The normal pH for human blood is 7.4.

2. ◆ The letters pH stand for potential of hydrogen, since pH is effectively a measure of the concentration of hydrogen ions (that is, protons) in a substance. The pH scale was devised in 1923 by Danish biochemist Søren Peter Lauritz Sørensen (1868–1969).

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pH Cultural  

1. In chemistry, a measure of the strength of an acid or a base. A neutral solution has a pH of 7; acids a pH between 0 and 7; bases a pH from 7 to 14. Specially treated strips of paper (see litmus), or more precise instruments, may be used to measure pH.

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Example Sentences

These proteins also showed an unusual ability to remain stable under extreme conditions, including very high temperatures, extreme pH levels, and highly salty environments.

From Science Daily

By understanding how bacterial metabolism drives this type of motion, scientists may be able to slow or stop it by altering environmental conditions such as pH or sugar levels.

From Science Daily

Because swashing depends on fermentation and acidic by products, altering factors such as surface pH or sugar levels could limit bacterial growth.

From Science Daily

Factors such as sugar availability, pH levels, and surface chemistry could play a major role in limiting bacterial movement.

From Science Daily

In 2024, according to the National Science Foundation, about 1 in 3 newly minted economics Ph.D.s in the U.S. were women, a considerably lower share than in other social sciences, business, the humanities and scientific disciplines.

From Salon