Boiling liquid

transforms

into gas

Gas

 

= calories brought by
surrounding atmosphere

 

LPG is an abbreviation for 'Liquefied Petroleum Gas'.

It is a gas in normal conditions but is stored in cylinders under pressure as a liquid

There are two basic types of LPG.

Butane is commonly used as lighter, heater or camping stove fuel and in recent times as a propellant for aerosol cans of paint, hair spray, fly spray and so on. Butane cylinders can generally be used indoors

Propane used primarily for heating and hot water and commercial applications and is supplied in cylinders or static bulk vessels where supply is required regardless of ambient temperature. Propane cylinders are stored and and used outdoors

LPG when compressed into a cylinder or bulk tank it easily changes to a liquid state. So allowing a large amount of gas (stored energy) to be contained in a relatively small space. Likewise the reverse process occurs when decompressed or allowed to escape the pressure vessel. The liquid gas boils and quickly reverts to its gaseous state (vapourise) and so LPG is often called a vapour.

To recap - LPG when in a suitable pressurised tank or cylinder  it will remain liquid, occupying only a small space. Release some of the liquid and it will immediately boil and revert to its gaseous state, expanding as it does so. Liquid Propane expands to 250 times its liquid volume when reverting to gas. The reverse applies, as gaseous LPG will 'shrink' by 250 times when compressed and liquification takes place.

 

The liquid is boiling, releasing vapour (gas) as it does so just like boiling water releases steam, (vapour) albeit at a much cooler temperature. Propane will do this right down to minus 42 degrees C, which ensures that it will vapourise in all but the coldest climates and conditions.

 

If you release liquid propane into the atmosphere it will be seen to bubble and fizz.

Butane however will only vapourise readily from temperatures 0 - 2 degrees Celcius, so outdoor appliances in the winter will need a propane supply
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