pH
1 of 2noun
ˈpē-ˈāch 
: a measure of acidity and alkalinity of a solution that is a number on a scale on which a value of 7 represents neutrality and lower numbers indicate increasing acidity and higher numbers increasing alkalinity and on which each unit of change represents a tenfold change in acidity or alkalinity and that is the negative logarithm of the effective hydrogen-ion concentration or hydrogen-ion activity in gram equivalents per liter of the solution
also : the condition represented by a pH number
PH
2 of 2abbreviation
1
pinch hit
2
public health
3
Purple Heart
Example Sentences
Recent Examples on the Web
Kiana Murden, Vogue, 23 Aug. 2022 The National Eczema Association recommends a cleanser without fragrance and with a low pH, which better complements the skin’s natural pH. The best way to find something that meets these parameters? Mara Santilli, SELF, 3 Aug. 2022 The standard normal pH is kept in a tight range of 7.35 to 7.45. Dr. Michael Daignault, USA TODAY, 28 July 2022 The pH is a measure of how acidic or alkaline the water is. Quartz, 19 July 2022 Retailing for just $12, the Tower 28 facial spray is a pH-balancing hypochlorous acid toner that soothes sunburn and supports the skin barrier. Nicol Natale, PEOPLE.com, 26 July 2022 It's specially formulated with a balanced pH of 4.5 to help evenly distribute color. Dori Price, Good Housekeeping, 15 June 2022 Changing pH involves applying either sulfur (to lower it) or lime (to raise it) and is a gradual process. Miri Talabac, Baltimore Sun, 29 June 2022 Our last pick is another two-bar set: Kitsch's Nourishing Bars, formulated with gentle essential oils and pH-balancing natural ingredients that'll get your hair in beautiful shape. Annie Burdick, PEOPLE.com, 29 June 2022 See More
Noun
Apply Acwell’s toner to balance skin’s pH, reduce pigmentation, and promote a bright, radiant complexion. Kiana Murden, Vogue, 23 Aug. 2022 The National Eczema Association recommends a cleanser without fragrance and with a low pH, which better complements the skin’s natural pH. The best way to find something that meets these parameters? Mara Santilli, SELF, 3 Aug. 2022 The standard normal pH is kept in a tight range of 7.35 to 7.45. Dr. Michael Daignault, USA TODAY, 28 July 2022 The pH is a measure of how acidic or alkaline the water is. Quartz, 19 July 2022 Retailing for just $12, the Tower 28 facial spray is a pH-balancing hypochlorous acid toner that soothes sunburn and supports the skin barrier. Nicol Natale, PEOPLE.com, 26 July 2022 It's specially formulated with a balanced pH of 4.5 to help evenly distribute color. Dori Price, Good Housekeeping, 15 June 2022 Changing pH involves applying either sulfur (to lower it) or lime (to raise it) and is a gradual process. Miri Talabac, Baltimore Sun, 29 June 2022 Our last pick is another two-bar set: Kitsch's Nourishing Bars, formulated with gentle essential oils and pH-balancing natural ingredients that'll get your hair in beautiful shape. Annie Burdick, PEOPLE.com, 29 June 2022 See More Word History
Etymology
Noun
German, from Potenz power + H (symbol for hydrogen)
First Known Use
Noun
1909, in the meaning defined above
Phrases Containing pH
Kids Definition
pH
noun
ˈpē-ˈāch
: a measure of the acidity or alkalinity of a substance
Lemon juice has a pH of about 2.5.
Water has a pH of 7.
Medical Definition
ph 1 of 2
abbreviation
1
pharmacopoeia
2
phosphor
3
phot
pH
2 of 2noun
(ˈ)pē-ˈāch
: a measure of acidity and alkalinity of a solution that is a number on a scale on which a value of 7 represents neutrality and lower numbers indicate increasing acidity and higher numbers increasing alkalinity and on which each unit of change represents a tenfold change in acidity or alkalinity and that is the negative logarithm of the effective hydrogen-ion concentration or hydrogen-ion activity in gram equivalents per liter of the solution
instead of saying that the concentration of hydrogen ion in pure water is 1.00 x 10−7, it is customary to say that the pH of pure water is 7 Linus Pauling
Linus Pauling also : the condition represented by such a number compare pk