Definition. The partial pressure of a given gas is defined as the pressure exerted by that gas alone. For example, consider the gaseous mixture of oxygen, nitrogen, carbon dioxide, and water vapor, the typical mixture found in alveolar gas.
From Wikipedia, the free encyclopedia. Philadelphia County is a county located in the commonwealth of Pennsylvania. At the 2010 census, the population was 1,526,006, making it the most populous county in the state, despite being the second smallest county in the state by land area.
Snyder County, Pennsylvania. Snyder County is a county in the U.S. state of Pennsylvania. As of the 2010 census, the population was 39,702. The county seat is Middleburg. Snyder County was formed in 1855 from parts of Union County. Snyder County comprises the Selinsgrove, PA Micropolitan Statistical Area, which is also included in the Bloomsburg-Berwick-Sunbury, PA Combined Statistical Area.