wavelength waveÂ·length (wÄv'lÄngkth', -lÄngth') n. Symbol Î» The distance between one peak or crest of a wave of light, heat, or other energy and the next corresponding peak or crest.
Causes: Emphysema: The number one cause of emphysema is smoking. Other contributing factors in its development or exacerbation (increase in severity) include long-term exposure to other lung irritants, such as air pollution, chemical fumes, or dust.
The main cause of emphysema is smoking. The tiny air sacs or alveoli at the bottom of the lungs, which cover a huge lung area, are surrounded by tiny blood vessels. Here, as the oxygen reaches the alveoli, it is absorbed by the blood vessels and then transferred into the bloodstream and to the rest of the body.