Editing Propane (section)

== Comparison with natural gas ==
Propane is bought and stored in a liquid form, LPG. It can easily be stored in a relatively small space.

By comparison, [[compressed natural gas]] (CNG) cannot be liquefied by compression at normal temperatures, as these are well above its [[critical temperature]]. As a gas, very high pressure is required to store useful quantities. This poses the hazard that, in an accident, just as with any compressed gas cylinder (such as a CO<sub>2</sub> cylinder used for a soda concession) a CNG cylinder may burst with great force, or leak rapidly enough to become a self-propelled missile. Therefore, CNG is much less efficient to store than propane, due to the large cylinder volume required. An alternative means of storing natural gas is as a [[Cryogenics|cryogenic]] liquid in an insulated container as [[liquefied natural gas]] (LNG). This form of storage is at low pressure and is around 3.5 times as efficient as storing it as CNG.

Unlike propane, if a spill occurs, CNG will evaporate and dissipate because it is lighter than air.

Propane is much more commonly used to fuel vehicles than is natural gas, because that equipment costs less. Propane requires just {{Convert|1,220|kPa|psi|0}} of pressure to keep it liquid at {{Convert|37.8|C|F|0}}.<ref name="Vapor Pressure">{{cite web|title =Propane Vapor Pressure|website =The Engineering ToolBox|year =2005|url =http://www.engineeringtoolbox.com/propane-vapor-pressure-d_1020.html|access-date =2008-07-28}}</ref><!-- The popular culture section has been deliberately removed from this article. Please do not reinsert it. -->