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.
Causes of Emphysema. The most common emphysema causes are from breathing in fumes and other irritants that damage the lungs and airways. Cigarette smoking is the most common irritant that causes the disease, but other factors (including dust and genetics) can cause it as well.