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 most common cause of emphysema is smoking. Pulmonary fibrosis involves scarring, or fibrosis, in the lungs. This process causes air sacs and the supporting lung tissue to become stiff and thick. Fibrosis worsens over time and the lungs are not able to move oxygen into the blood stream.