Scientific laws are considered established and universally applicable (to certain class of things or phenomenon under appropriate conditions) but not necessarily definitive. Also called laws of science.
Afflictions of the respiratory system include irritation and infection of the ears, nose and throat. Respiratory problems also may involve congestion, which can be decreased by inhaling rosemary (especially the verbenone type), hyssop (use var. decumbens only), tea tree, eucalyptus, lavender or peppermint.
A carrier oil is an odorless neutral oil in which the essential oil is dissolved. (Some typical carrier oils are olive oil, grape seed oil, sunflower oil, and walnut oil.) The mixture is then rubbed on the chest to relieve a cough. The fumes of an essential oil can also be used to treat a cough.