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.
Developing a barrel chest can also simply be a sign of old age. In many cases, the ribcage remains partially expanded because of persistent lung over inflation, resulting in less efficient breathing and possibly shortness of breath. A case is not typically treated, although the underlying cause may be. Commonly associated with older men, barrel chest can also manifest itself in women and even children. Children who suffer from chronic asthma, cystic fibrosis, a connective tissue disorder, emphysema, or who are obese are most at risk.