nonpolar covalent bond. (physical chemistry). A bond in which a pair of electrons is distributed or shared equally between two atoms. 1  Facebook.2  Twitter.onpolar covalent bond. (physical chemistry). A bond in which a pair of electrons is distributed or shared equally between two atoms. 1  Facebook.
When is a barrel chest a sign of a disease process? Chronic obstructive pulmonary disease (COPD) is the most common instance in which a barrel chest will occur. In these cases, itâs a sign of the lungs being over-expanded. This is caused by the loss of elasticity and results in the person having hyper-inflated lungs.
Smoking marijuana may also cause COPD. People who inhale cooking fumes or have extended exposure to pollutants, such as workplace or environmental hazards, can also develop COPD. It is also believed that genes play a role in who develops COPD and how severe it is. One known genetic cause of COPD is alpha-1 antitrypsin deficiency.