Since inspired air is 21% oxygen and atmospheric pressure is 760 mmHg (at sea level), the partial pressure of oxygen is 0.21 x 760 mmHg = 160 mmHg. As air moves into the alveoli, water vapor and carbon dioxide are added, and that reduces the partial pressure of oxygen to about 100 mmHg in the alveolar gas.
Philipsburg, Centre County, Pennsylvania. Philipsburg is a borough in Centre County, Pennsylvania, United States. It is located at 40Â°53â²42â³N 78Â°13â²09â³W / 40.89500Â°N 78.21917Â°W / 40.89500; -78.21917Coordinates: 40Â°53â²42â³N 78Â°13â²09â³W / 40.89500Â°N 78.21917Â°W / 40.89500; -78.21917 (40.895, -78.2193). It is part of the State College, Pennsylvania Metropolitan Statistical Area.
Harrodsburg, the county seat of Mercer County, was founded in 1774 by a stalwart band of pioneers led by James Harrod, of Pennsylvania. It was the only colonial city and the first permanent English settlement west of the Allegheny mountains. Referred to as the Birthplace of the West, Harrodsburg has a proud and remarkable heritage.