pH scale
Measures acid strength
The pH scale measures how acidic or alkaline a solution is, running from 0 to 14.
Pure water sits at 7, the neutral midpoint.
Lower numbers indicate acids (lemon juice has a pH around 2), higher numbers indicate bases (bleach is around 12).
The scale is logarithmic—each whole number represents a tenfold change in acidity.
- acidicBelow neutral pH
- alkalineHaving high pH
- neutralNot favoring any side
- pH levelMeasure of acidity
- litmusAcid-base indicator dye
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measurement type
pH scalethermometer
Heat-measuring instrument
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