Show all tho liquefied liquefied gases except oxygen and hydrogen havo been frozen by self evaporation in a vacuum by evajo rating liquid air in a vessel surrounded by liquid oxygen professor dewar succeeded in reducing tho air to a clear transparent it not been determined ter mined whether the oxygen of the mixture s really frozen or merely entangled among the particles parti clee of solid nitrogen in boino such way as rose water in cold cream or water in tho solid gelatin of calves foot jelly although puro oxygen has never been frozen it 1 possible that when mixed with nitrogen its freezing point 1 raland eo that tho two solidify together science |