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.
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.