A measure of hydrogen ion concentration equal to −log [H+] and ranging in value from 0 to 14.

  The strength of acids and bases.  Pure water has a pH value of 7, acids have a lower value and bases higher.

Scale ranging from 0-14, used to describe how acidic (0) or basic (14) a substance is. The pH is the measure of the hydrogen ion concentration in a solution.

A measure of the relative acidity and alkalinity of a solution; solutions having a pH value of 7.0 are neutral; (neither acidic or alkaline); pH-values 1 to 6 denote acidity; pH values of 8 to 14 deno [..]

p(otential of) H(ydrogen); the logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per liter; used as a measure of the acidity or alkalinity of a solution on a scale of 0-14 (where 7 is neutral).

Measures the degree of acidity or alkalinity of a substance, with 1 the most acidic, 7 neutral, and 14 the most alkaline (basic).

A scale that ranges in value from 0 to 14 that is used to measure the pH of a solution (Lesson 14, Lab 2)

A system used to describe the amount of acid in a solution. pH values from 1 to 7 are acidic while values above 7 are alkaline. Most food pH values fall between 2 and 9. Bacteria prefer a neutral pH of 7.0 but will also grow between pH 5 and 9. Molds and yeasts tolerate lower pH values compared to bacteria.

The pH scale is used to measure the amount of acid in a substance. The lower the number, the higher the amount of acid. Rain below pH 5 is said to be "acid rain". Plankton