why are
packets of chips filled with nitrogen and not air
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Answer:
Potato chip bags are not full of air, but of nitrogen gas. This is done to prevent the chips from oxidizing, which is part of what makes them go stale. Oxygen is very reactive, and likes to combine with other molecules whenever it can, causing chemical changes to take place.
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They are filled with nitrogen to protect them from react with oxygen and get oxidised.
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