pH1
/piːˈeɪtʃ
/noun Chemistry
A figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline. The pH is equal to −log10 c, where c is the hydrogen ion concentration in moles per litre.Prof. Lilley who had no experience in measuring the pHs of surfactant solutions having a high solids content was surprised to see a 0.3 difference in measurements....
- At relatively alkaline pHs (found under stress), even very low ABA concentrations found in the xylem of well-watered plants will limit leaf growth rate.
- Additionally, another 5 to 16% is excreted daily into the gastric juices, since TCAs have a pK a of 9.5 and are highly ionized at acid pHs, thereby favoring concentration in the acid stomach.
Origin
Early 20th century: from p representing German Potenz 'power' + H2, the symbol for hydrogen.
Rhymes
PH2
(also P.H.)
abbreviation
1Public Health.
2Purple Heart.
- organ loft
- organ maker
- organ meat
- organ note
- organo-
- organochloride
- organochlorine
- organoclay
- organo-compound
- organ of Corti
- organ of Ribaga
- organogenesis
- organogenetic
- organogenic
- organogenous
- organogram
- organographic
- organographical
- organographist
- organography
- organoid
- organoleptic
- organoleptically
- organological
- organologist