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.
Emphysema is a chronic (long-term) lung disease, usually caused by smoking. Emphysema is the main form of chronic obstructive pulmonary disease (COPD).Diagnosing emphysema usually requires pulmonary function tests, combined with a history of symptoms, such as shortness of breath.iagnosing emphysema can't be done with an X-ray alone. Computed tomography (CT scan) of the chest: A CT scan in someone with emphysema may show small pockets of air throughout the lung.