Hydrogen; oxygen; hydrogen and oxygen used in industry and science; hydrogen fuel and energy used in industry and science; hydrogen used in industry specific to motor vehicles, buses, trucks, aircraft, space ships, mining and logging vehicles, agricultural implements and tractors, road construction and maintenance vehicles, marine vessels, generators, electric generator power sets, plant and stations, commercial, institutional, residential, industrial premises and nuclear reactors; hydrogen fuel used in industry specific to motor vehicles, buses, trucks, aircraft, space ships, mining and logging vehicles, agricultural implements and tractors, road construction and maintenance vehicles, marine vessels, generators, electric generator power sets, plant and stations, commercial, institutional, residential, industrial premises and nuclear reactors; hydrogen for use with solar and natural gas; chemical additives and compound additives for fuel; fuel for nuclear energy and reactors; fuel elements for nuclear reactors; chemicals for use in industry; chemical products for use in industry; chemicals and fluids for use in the gas and oil industry; gas for industrial use; gas mixtures for use in industry and science; gas mixtures for ceramic materials for use in industry; preparations for the purification of gas; fuel economising compositions; chemical products for use in heating and cooling systems; chemicals for use in the treatment and purification of water