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.
Severe COPD can cause heart failure in the heartâs right ventricle, a condition called right-sided heart failure or cor pulmonale. In severe COPD, oxygen concentration in the blood falls to abnormally low levels. In response, the walls of the main blood vessels inside the lungs (pulmonary arteries) change.