A mixture of gas and liquid in a gas cylinder provides convenient packaging for a variety of purposes, among which the main uses are as follows:

Gaseous mixtures are often used to reduce the toxicity and flammability of a highly active object, similarly mixing other substances with pure substances can change the physical properties of the pure substance.

Typical use of gas mixtures

1. Used for instrument analysis. Pure gases and mixtures are often used to operate and calibrate analytical instruments. Zero-position gases (usually PURE substances, but ALSO containing a small or known concentration of a related component) are used in flame ion detection meters, which require a fairly low hydrocarbon content to achieve maximum even reading sensitivity. The "ZERO AIR" can BE used to adjust the zero position of the meter or to provide an oxidizer with a low hydrocarbon content for the analyzer to act on.

2. For the estimation of gases, which usually contain fewer relevant components, allowing the calibration of the analytical apparatus to this concentration value when the concentration level is known.

3. For disinfection. Ethylene oxide diluted to 12% is mixed with fluorocarbon-12, or 10-20% ethylene oxide mixed with carbon dioxide is commonly used for disinfection. Another disinfectant is propylene oxide. These mixtures are regulated in the United States by the Environmental Protection Regulatory Agency.

4. For medical treatment. A low concentration of carbon monoxide mixed in the air was used in lung diffusion experiments. A mixture of oxygen and varying percentages of carbon dioxide can be used for calibration of blood analysis gas analyzers. Cyclopropane, nitrous oxide, and certain chemically active gases that may be used individually and as mixtures for anesthesia.

5. The number of nuclear technologies used. A mixture of 0.95% isobutane and helium and a mixture of 1.3% butane and helium have both been used as Geiger counter gases. A mixture of 0.4% isobutane and helium and a mixture of 10% methane and argon were used as proportional counter gases.

6. For the manufacture of electronic components. A gas containing trace dopants such as trihydrogen arsenide, phosphine or ethborane. For example: gases such as hydrogen, helium, argon or nitrogen, which are used to make silicon semiconductors. A highly purified mixture of ammonia is used for nitriding. Silane, either pure or in mixtures, can be used for the deposition of silicon. A gas mixture similar to one of the above mixtures, if the content of trihydrogen arsenide and phosphine is high, is usually used to make grain semiconductors.

7. For welding. A mixture of oxygen and argon, carbon dioxide and helium-nitrogen can all be used for welding.

8. For cooling. Refrigerants such as a mixture of chloromethane and fluorocarbons can be used for cooling purposes.

9. Used for smoking. Both bromomethane and ethylene oxides can be used for smoking.

10. For chemical inspection. The American Society for Testing Materials uses gas mixtures as a protective atmosphere.

11. Used in metallurgy. Hydrogen - nitrogen can be used for heat treatment.

12. For leakage detection. Low percentage of fluorocarbon compounds. Can be used to detect leaks.