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.
Subcutaneous Emphysema Causes. One of the basic causes of subcutaneous crepitation is the seepage of air through the lacerations on skin caused by stabbing, blunt trauma or bullet wounds. Due to the muscular movements the air is readily drawn in and rapidly spreads to the neck and chest cavity.