Following reactions at very low temperatures were tried which may be possible to become a cause of explosion of an air-rectifying apparatus : (1) reactions between acetylene and products of discharge reaction in liquid air, (2) reactions between ethylene and ozone, (3) reactions between nitric oxide and ozone. Explosions occurred in these several experiments. It is discussed that an explosion of an air-rectifying apparatus may occur from ozone or atomic oxygen formed by electric discharge of particles which are charged through streaming in the apparatus
