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.
1 Physical examination: Listening to the lungs and heart, and looking at the veins in the neck, can give a doctor reason to suspect COPD or heart failure. 2  Chest X-ray: Heart failure may cause fluid in the lungs to be visible on a chest X-ray; in COPD, the lungs are usually clear.