Air components are separated by criogenic distillation.
The scientific term for separating is "extraction." It refers to the process of separating one substance from another using physical or chemical methods.
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The word "division" can function as a noun or a verb. As a noun, it refers to the act of separating into parts or groups. As a verb, it describes the action of dividing or separating something.
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No one obtains hydrogen by separating it from air. There's not enough hydrogen present in air for that to be a viable source. However, it's possible to mix oxygen and hydrogen, yes. It forms a flammable (and explosive, if you get the proportions just right) mixture of gases.
The boundary separating cold surface air replacing warm air is called a cold front. Cold fronts occur when a cold air mass moves into an area occupied by warmer air, causing a sharp transition in temperature and potentially leading to stormy weather.
The correct spelling of the word is "separates".