An inert gas is a non-reactive gas used during chemical synthesis, chemical analysis, or preservation of reactive materials. An inert gas is any gas, either elemental or molecular in structure, that does not react under normal circumstances. Inert gases are selected for specific settings for which they are functionally inert since the cost of the gas and the cost of purifying the gas are usually a consideration. Inert gases are ideal for combining with other gases, or otherwise using them, to prevent chemical reactions from taking place. Unlike noble gases, an inert gas is not necessarily elemental and is often a compound gas.
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