ABSTRACT
PADI — See Provisional Acceptable Daily Intake. PAH — See polycyclic aromatic hydrocarbon; poly-
nuclear aromatic hydrocarbon. PAI — Acronym for pure active ingredient. pain — A feeling of distress, suffering, or agony caused
by stimulation of specialized nerve endings. pain intervention — Techniques used to relieve the pain
from disease or trauma. pain mechanism — A network of nerves that transmit
unpleasant sensations to the body because of physical disease and trauma involving tissue damage.
