- pH, pH scale - (chemistry) p(otential of) H(ydrogen); the logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per liter; provides a measure on a scale from 0 to 14 of the acidity or alkalinity of a solution (where 7 is neutral and greater than 7 is acidic and less than 7 is basic)
--1 is a kind of agency, federal agency, government agency, bureau, office, authority; hydrogen ion concentration; agency, federal agency, government agency, bureau, office, authority; hydrogen ion concentration
--1 is a part of
--1 has particulars: acidity; alkalinity; neutralityDepartment of Health and Human Services, Health and Human Services, HHS