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

Chemistry.

1. phenyl.

ph.

⁴

abbreviation

1. phase.

2. phone.

P.H.

⁵

abbreviation

1. Public Health.

ph.

¹

abbreviation

1. phase

Ph

²

symbol

1. phenyl group or radical

ph

³

abbreviation

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

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

“Out of respect for P.H. Nargeolet and his family, and the other four people who perished so recently at the site, and their families, the company has decided that artifact recovery would not be appropriate at this time,” the firm wrote.

From Seattle Times

“In light of the OceanGate tragedy, the loss of our dear colleague Paul-Henri ‘P.H.’

From Seattle Times

Cameron was also personally affected by the tragedy, as his longtime friend, French Titanic explorer Paul-Henri “P.H.”

From Los Angeles Times

Mr. Nargeolet, who went by P.H., had become a semi-permanent fixture, a quasi-member of Titanic royalty, a star and co-pilot on the OceanGate expeditions.

From New York Times

Cameron also told ABC News that he was mourning the death of French Titanic explorer Paul-Henri “P.H.”

From Los Angeles Times