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.
Borough of Sewickley. Allegheny County. Welcome to the Borough of Sewickley. Sewickley is an Indian word for Sweet Water and has a history that dates back to the mid 1700's, with the first written mention of Sewickley dated December 31, 1767.