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.
Use steam cautiously. Dry airways can make your cough worse. You may find relief from taking a shower or bath before bed -- or just sitting in a steamy bathroom. Edelman has one caution: If you have asthma, steam can actually make a cough worse.. Watch the humidity. Humidifiers can help coughs if the air is dry.