1 Gases consist of large numbers of molecules (or atoms, in the case of the noble gases) that are in continuous, random motion. 2  The volume of all the molecules of the gas is negligible compared to the total volume in which the gas is contained.  Attractive and repulsive forces between gas molecules is negligible.
Medical authorities say that Olympic sprint champion Florence Griffith Joyner died of suffocation month ago after suffering seizure while she slept; say seizure was caused by congenital abnormality of blood vessels in her brain (M)
Causes, symptoms and treatment. Monash University lecturer Maria Strydom is thought to have died of altitude sickness while attempting an ascent of Mount Everest, after fluid swelled in her brain. Her husband, Robert Gropel, suffered heart problems on the same climb.