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Types of Compressed Gas
There are three major types of compressed gases: liquefied, non-liquefied, and dissolved.
~ Liquefied gases
Gases can be liquefied from vapor through the act of cooling or compression, and remain in liquid state when kept in pressurized cylinders. Initially the cylinder will be nearly full of liquid, with gas filling the space above the liquid.
Some gases require dramatic cooling and compression to become liquid, these are known as cryogenic gases. A very small amount of cryogenic gas can expand into large volumes of gas when returned to room temperature. Cryogenic gases are extremely cold, with a boiling point of -90° C, and so must be handled with great care to avoid thermal burns.
Examples of liquefied gas include: petroleum, natural gas, ammonia, chlorine, propane, nitrous oxide, and carbon dioxide
Non-liquefied gases cannot become liquid when compressed at normal temperatures. They are always in a vapor state and are known as permanent gases.
Examples of non-liquefied gases include: oxygen, nitrogen, helium and argon
Sometimes gases are mixed in a solution with another gas or liquid, to make them more stable for handling. This is known as dissolved gas. Acetylene is the only common dissolved gas, as it is extremely unstable in pure form. Acetylene is very effective for welding, cutting and illumination, and is therefore very popular in industry in a dissolved, relatively stable form.
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