American Heritage® Dictionary of the English Language, Fourth Edition
- n. A measure of the acidity or alkalinity of a solution, numerically equal to 7 for neutral solutions, increasing with increasing alkalinity and decreasing with increasing acidity. The pH scale commonly in use ranges from 0 to 14.
- n. metrology Symbol for the picohenry, an SI unit of electrical inductance equal to 10−12 henrys.
- abbr. chemistry The negative of the logarithm to the base 10 of the concentration of hydrogen ions, measured in moles per liter; a measure of acidity or alkalinity of a substance, which takes numerical values from 0 (maximum acidity) through 7 (neutral) to 14 (maximum alkalinity).
- From p, denoting negative logarithm, and H, denoting hydrogen. (Wiktionary)
- p(otential of) h(ydrogen). (American Heritage® Dictionary of the English Language, Fourth Edition)
“The term pH is a convenient way to express the concentration of hydrogen ions (H+) in an aqueous solution.”
“And if the pH is above 3.3, it moves to Medium Sweet, and if the pH is as low as 2.9 or lower, the wine moves to Dry.”
“In regular soap, fats or oils are boiled with an alkali agent, such as lye or wood-ash, and the resulting mess which comes from this combination of heat and pH is a solid substance with a curious molecular makeup.”
“Ratio above 4.1, but using the pH adjustment, a sweeter wine with a ratio of, say, 4.4 might actually be moved to Medium Sweet if the pH is significantly lower.”
“But if the pH is 3.3 or 3.4, it moves up to Medium Dry.”
“And if the pH is 2.8 or below (highly unlikely), the wine could be called Dry.”
“If your soil pH is adequate (7.0 to 7.5) Alfalfa can work as it will root quite deeply given adequate soil (read deep) prep and proper pH.”
“The consequences of this drop in pH levels is pretty severe.”
“The first was a rise in pH to over 9.0 in the unbuffered suspension, as a result of the alkaline nature of the glass surfaces (pH being measured with a semi-micro glass electrode that I constructed).”
“The energy liberated during the electron transport is used to pump protons across the membranes, so that a difference in pH and electrical potential between the two sides is created.”
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