The study of waves therefore forms a topic of central importance in all physical science and engineering. 1  The simplest types of wave motion are vibrations of elastic media, such as air, crystalline solids, or stretched strings. If, for example, the surface of a metal block is struck a sharp blow, the deformation of the surface material compresses the metal in the vicinity of the surface, and this transmits the disturbance to the layers beneath.
There are many aromatherapy recipes for treating the symptoms of respiratory infections. Here are a few: For blocked sinuses and tight dry coughs add two drops of eucalyptus radiata essential oil to a bowl of hot water. Drape a towel over the head and lean over the bowl.
Aromatherapy helps ease coughs. Photo Credit Frau hustet image by R.-Andreas Klein from Fotolia.com. The best way to use aromatherapy when it comes to alleviating a cough is by using steam. A cough is usually present when the lungs, bronchial tubes, larynx or throat are inflamed.