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.
1 Leaks of CSF are usually caused by blunt trauma to the head and/or ears or prior sinonasal surgery. 2  However, spontaneous CSF leaks can occur in patients with elevated intracranial pressure. 3  Diagnosing CSF leaks usually involves a physical exam, nasal endoscopy, CT or MRI scan and a fluid collection.