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.
Westmoreland County is a county located in the U.S. state of Pennsylvania. At the 2010 census, the population was 365,169. The county seat is Greensburg. Cut from Lancaster, Northumberland, and later Bedford Counties, Westmoreland County was founded on February 26, 1773 and was the first county in the colony of Pennsylvania in which its entire territorial boundary was located west of the Allegheny Mountains.