This report describes an experimental studs of hydrogen jets burning in air, hydrogen formation by sodium in humid air atmospheres, and the effects of nitrogen, water vapor, sodium vapor sodium vapor/aerosol, jet velocity, and jet temperature on ignition of hydrogen jets. The results show that hydrogen jets above 1450o F (788oC) issuing into an air atmosphere need no ignition source for ignition, a hydrogen jet temperature higher than 500oF (260oC) and containing more than sir grams of sodium per cubic meter of jet gas will anto-ignite in an air atmosphere, the beaming efficiency of a hydrogen jet decreases rapidly to zero when the concentration outside the flame region approaches 10 percent, and hydrogen does no form from a sodium-nitrogen jet issuing into a humid air atmosphere until the ratio O2/(H2O+O2) is less than 0.50.
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