Advertisement
Advertisement
ph
1Optics.
- phot; phots.
pH
2Chemistry.
- 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
3abbreviation for
, Chemistry.
ph.
4abbreviation for
- phase.
- phone.
P.H.
5abbreviation for
- Public Health.
ph.
1abbreviation for
- phase
Ph
2the chemical symbol for
- phenyl group or radical
ph
3the internet domain name for
- Philippines
pH
4noun
- 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′ /
- 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.
- ◆ 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).
Advertisement
Advertisement
Advertisement
Advertisement
Browse