Compressed or liquified gases:

The organization recommends which free acetylene should not ordinarily be handled at pressures greater than 15 psig since, if handled at higher pressures without special equipment, it could decompose along with explosive violence. As a result, acetylene cylinders are packed along with an inert porous material which is saturated along with acetone.  Acetylene charged within the cylinder dissolves within the acetone and in solution will not decompose at or below the maximum authorized shipping pressure of 250 psig at 70ºF.

Compressed or liquified gases are also frequent elaborates according to loosely-knit families to that they belong by general properties, origins, or uses.  The main families of gases are atmospheric fuel gases, gases, aerosol gases, refrigerant gases, and poison gases.

Atmospheric gases comprise one family. That most abundant member is nitrogen, constituting 78 % of air through volume; oxygen, constituting 21 % of air through volume, is its second most abundant member. Many of the remaining 1 % of the atmosphere consists of a sub-family of gases, inert gases which share the property of chemical inertness.  Inert gases are chiefly argon, along with minute quantities of helium, krypton, neon, xenon and radon. The last four are frequently called the rare gases due to their scarcity.  Hydrogen also occurs minutely in the atmosphere, since do a huge variety of trace constituents, small amounts of carbon dioxide, and large amounts of water vapor.

Another family of gases is the fuel gases.  Fuel gases burned in air or along with oxygen to generate heat make up a huge family related through their main use. Its members are notably the hydrocarbons including liquefied petroleum (LP) gases, propane, methane, butane, and welding gases like as hydrogen and acetylene.