KnowrapHLinked fromLinked fromThe 129 pages that link to pH, each with the reason it gives.All 129Broader topic 3Related 108Narrower topic 9Compared with 9Logarithmic scaleBroader topic: Its values compress hydrogen-ion activities spanning many orders of magnitude.AcidityBroader topic: This is the most common numerical expression of aqueous acidity.Thermodynamic activityBroader topic: Its definition uses activity rather than hydrogen-ion concentration.