Vapor pressure called partial pressure. For example, air at sea level, and saturated with water vapor at 20 °C, has partial pressures of about 2.3 kPa of water, 78 kPa of nitrogen, 21 kPa of oxygen and 0.9 kPa of argon, totaling 102.2 kPa, making the basis for standard atmospheric pressure. Vapor pressure is measured in the standard units of pressure. The International System of Units (SI) recognizes pressure as a derived unit with the dimension of force per area and designates the pascal (Pa) as its standard unit. One pascal is one newton per square meter (N·m or kg·m·s). Experimental measurement
ALCO PA display in the museum. Unit DH-17 (former D&H #17) was painted in the classic Southern Pacific Daylight colors, but as of February 2010 had been painted over in primer. Algoma Central 78 is the former Denver and Rio Grande PB-1 6002. It was converted to a steam generator car in October 1965. It gained Blomberg B trucks in 1980. It was sold to Ansco in late 1987 for service on the Ski Train. It was sold again in 2007 to the Algoma Central. ALCO PA ALCO PA refers to a family of A1A-A1A diesel locomotives built to haul passenger trains