Opposite application:

An opposite application relates members of another huge family, the refrigerant gases. A refrigerant gas liquifies simply under pressure and works through being compressed to a liquid that then absorbs huge amounts of heat as it circulates by coils whereas it vaporizes back within gaseous form.  Instances of refrigerant gases involve ammonia and the fluorocarbons (freon).

Aerosol propellant gases make up a family also associated through use through the introduction of pressure-packaged products used in the form of a spray or foam.  Propellant gases have moderate vapor pressures at room temperatures (70 psig down to 35 psig, and even lower in a few cases).  It is commonly agreed in which a good propellant should also be chemically stable, nontoxic, noncorrosive, and inexpensive. A fluorocarbons (freon) and nitrous oxide are the most generally used propellant gases.

Gases considered to be members of the poison gas family are commonly those in which the ICC has categorized as poison gases to ensure public safety within interstate shipments. There are two examples of these gases are hydrogen cyanide and phosgene.