International Space Station (ISS) Cabin Air Loss Event

A significant drop in cabin pressure was detected in the International Space Station (ISS) in late December of 2003 and continued through mid-January of 2004. Analytical methods discussed will define the calculations required to determine the cabin air mass via total pressure, nitrogen partial pressure, oxygen partial pressure, carbon dioxide partial pressure, and water vapor partial pressure. Operational and analytical issues will be outlined and discussed as well as describing the leakage cause.