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.
In 1797, Henry and James Philips laid out Philipsburg, the largest community in Moshannon Valley. Philipsburg prospered under the leadership of their younger brother, Hardman. In addition to its associations with lumber and coal mining, Philipsburg was also home for the famous wood-screw mill, built by Hardman Philips in 1821. In 1883 John Blair Lynn had this to say about Philipsburg: