Re: Can argon gas be used to power an engine.If so explane how it will work.

Bruce, argon is a "Noble Gas".  It does not want to combine with 
anything.  If you look on the periodic table, the column of the far right
is the nobel gases.  As far as common ways to run an engine, there are 
only two ways for argon to accomplish that feat.  The first one would be 
to compress the gas, but the size of the tank to provide this energy would 
have to be tremendous.  The second way would be to induce a radio wave in 
a stream of argon so that you form plasma, and then use the heat from the 
plasma to power a steam engine, there is an analytical instrument which 
uses this principle to analyze for metals in chemistry, Inductively 
Coupled Plasma (ICP for short).  But to be honest, it would be more energy 
efficient to take the energy used to produce the radio wave and heat the 
water with microwave or more energy efficient means.  Hope this helps.