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.
Chronic obstructive pulmonary disease or COPD refers to respiratory (lung) diseases that cause breathing difficulties and block airflow from the lungs. Chronic bronchitis (inflammation and narrowing of the bronchial tubes) and emphysema (damage to the lining of the air sacs in the lungs) are the two most common types.hronic obstructive pulmonary disease or COPD refers to respiratory (lung) diseases that cause breathing difficulties and block airflow from the lungs. Chronic bronchitis (inflammation and narrowing of the bronchial tubes) and emphysema (damage to the lining of the air sacs in the lungs) are the two most common types.