Expert: Leo Carr - 4/14/2006

Question
which gases are filled in ac's,refrigerator,cooking gas cylinder,air balloon,balloon.

Answer
The gas that is used in air conditioners and refrigerators are types of FREON.  These are flurochlorocarbon organics that stay cold. This just means they contain atoms of fluorine, chloride, and carbon in different numbers. There are many types, depending upon the compressor that is used on the machine.

Cooking gas can be liquid propane or natural gas.  Both are simple hydrocarbons, but very flammable.  

An air balloon,(if I think I know what you are asking) is filled with hot air.  The air is heated and of course rises, thus filling the balloon.  Hydrogen gas is sometimes used however, this is very dangerous and unstable near any heat, power lines, etc.

A balloon can be filled with air (mixture of nitrogen, oxygen, carbon dioxide, trace gas) or helium.  Helium is lighter than air thus it will float.

Hope this helps.