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

Zambia's government spokesperson Cornelius Mweetwa hit back, saying the "laboratory results show that PH levels have returned to normal" in the area and the water was safe to drink.

From BBC

Watson, who last appeared on the big screen as Meg in 2019’s “Little Women,” followed by a role in the promotonal short film “Paradoxe” for a Prada campaign in 2022, is studying for the equivalent of a Ph.D in creative writing at Oxford University.

From Los Angeles Times

“Animals that inhabit shallow waters have evolved to cope with variability in environmental conditions, but in the deep sea, there's very little change in oxygen or temperature or pH across the year,” Barry said.

From Salon

It’s a good idea to test your soil — a survey of heavy metals, nutrients, minerals and pH levels costs less than $200 — and consider all the options for repairing it, soil scientists said.

From Los Angeles Times

Some plants, such as blueberries, azaleas and camellias, prefer acidic soils, i.e., soils with a pH below 7.

From Los Angeles Times