The main sphere of hydrogen application is in the production of chemical products such as ammonia NH₃, methanol CH₃OH, and other alcohols, aldehydes, ketones for the hydrogenation of solid and heavy liquid fuels, fats, and various organic compounds, as well as for the synthesis of hydrogen chloride (HCl) and the hydroprocessing of petroleum products.

Metallurgy

• For combustion with oxygen, hydrogen is used in hydrogen burners for metal welding and cutting (hydrogen flame temperature can reach 2600 °C).
• Thermal treatment of cold-rolled steel.
• Atomic hydrogen welding (at temperatures of 4000 °C), electric arc welding using alternating current that burns between two tungsten electrodes in a hydrogen atmosphere.
• Hydrogen is used to reduce certain metallic oxides to recover metals such as molybdenum, tungsten, and others.
• Thermal hydrogen treatment of titanium alloys.
• Creation of a protective nitrogen-hydrogen atmosphere for the heat treatment of pipes.

Meteorology

• Hydrogen is used to fill meteorological balloons.

Glass Industry

• Hydrogen is used in the production of float glass and in the manufacturing of quartz glass, which is produced by melting quartz, rock crystal, or synthetic silicon dioxide in an oxygen-hydrogen flame.

Food and Cosmetic Industry

• Hydrogen is used in the production of margarine through the hydrogenation process of liquid vegetable oils into solid fats.

Laboratory Applications

• Hydrogen is used as a carrier gas in gas chromatography in chemical laboratories.
• Hydrogen is used for leak testing.

• Working with hydrogen is only allowed in facilities specifically designed for this purpose, which have reliable ventilation with upper-zone exhaust, and where the electrical equipment is installed in explosion-proof configurations.
• The storage area for hydrogen cylinders should be equipped with natural ventilation and upper-zone exhaust.
• Storage of hydrogen cylinders together with oxygen, chlorine, nitrogen dioxide, and other oxidizing agents, as well as flammable substances, is prohibited.
• The gas extraction from the cylinder should only be done through a hydrogen-specific regulator.
• When conducting experiments using pure hydrogen or hydrogen mixtures (especially when working with large gas volumes on research installations), the release of cleaning and exhaust gases should be done through special pipes into the atmosphere through a window.
• The discharge should be conducted into the open atmosphere through a sturdy pipeline at a slow enough rate to prevent the possibility of an explosive mixture at the outlet. It is recommended to dilute the mixture with an inert gas in the pipeline. Evacuating the exhausted hydrogen or hydrogen mixtures using exhaust pipes with a fore-vacuum pump is prohibited.
• During the use of the cylinder, it is mandatory to leave hydrogen inside with an excess pressure of at least 0.5 kg/cm2.
• After completing the use of the cylinder, the valve on the cylinder must be tightly closed, and the gas should be vented from the regulator. Leaving the regulator pressurized is not allowed.