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.
Common Causes of COPD. Cigarette smoke is by far the most common reason people get COPD. You can also get it from tobacco products, such as cigar and pipe smoke, especially if you breathe in the smoke. Secondhand smoke is also an issue. Even if you arenât a smoker, you can get COPD from living with one.