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.
Emphasema Emphysema Emphysema   its called emphysema emphysema     Reason:   Emphysema is a disease that is linked to smoking and results in a reduction in the number and elasticity of alveoli. People with emphysema have difficulty breathing.