What is rancidity ? Why the packets of chips and fries are flushed or filled with nitrogen gas while packing?

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It is the foul smell produced by the oxidation of oils and nuts.

Mostly the bitter taste of peanut and food made by frying is due to rancidity .

Normally the oily substances which are not covered properly , react with the oxygen of air and get oxidised thus give a foul smell.

Removal of oxygen avoids the oxidation of fool items. So during packaging nitrogen gas is used to make inert atmosphere .

That is the reason most of the chips are packed with plenty of Nitrogen gas.

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