ph

¹

Optics.

1. phot; phots.

pH

²

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.

Ph

³

abbreviation for

, Chemistry.

1. phenyl.

ph.

⁴

abbreviation for

1. phase.
2. phone.

P.H.

⁵

abbreviation for

1. Public Health.

ph.

¹

abbreviation for

1. phase

Ph

²

the chemical symbol for

1. phenyl group or radical

ph

³

the internet domain name for

1. Philippines

pH

⁴

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

pH

/ 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).

pH

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.

Example Sentences

Both a freshwater and brackish species, the golden mussel can tolerate wide ranges in salinity, temperature and pH levels, and cantravel much farther than people might think.

From Los Angeles Times

“The digestive tract, or rumen, basically requires movement. There has to be things moving out of that rumen constantly in order for the pH balance and microbiome to stay where it should be,” he said.

From Los Angeles Times

They also found the electric streaming potential increases with decreased concentration of ions or increased pH in the fluid.

From Science Daily

The researchers theorize that the permafrost has started to thaw due to these developments, causing orange streams that have lower pH and higher concentrations of iron, sulfate and trace metals.

From Salon

They first tested whether the strains showed any differences in their responses to pH and temperature.

From Science Daily