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.
4 Unexpected Causes of Chest Pain. 1. Acid Reflux. The most common cause of NCCP is gastroesophageal reflux disease (GERD), says Dr. Whitfield. GERD is a chronic digestive disease where stomach acid flows up into the esophagus, causing irritation, which can be more painful after a meal.