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.
a front
Separating.
distilling
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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.
the decimal point
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.
A front
Fronts
The correct spelling of the word is "separates".