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.
My boyfriend was complaining of a deep nagging cough associated with his flu-like symptoms. In addition, he wasnât able to sleep as a result of the terrible coughing. I suggested he take a drop of Tea Tree oil and apply it to his chest in hopes of opening up the airway and quiet the cough. He did. The cough immediately subsided. He healed from the flu within a few days. Prior to this, however, each time he had a coughing spell, he would repeat the process with the same result!