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.
Smoking cigarettes is by far the most common cause of emphysema. And emphysema is by far the most common cause of giant bullae in the lungs. There are limited cases of bullae appearing in the lungs as a result of bronchial illnesses from high air pollution levels, or occupational exposure to chemical fumes.