sealed packets in which food items are sold are usually filled with nitrogen. How does it help?

It is oxygen that causes most of the food to spoil, as most microbes require oxygen to live. Nitrogen is an inert gas as it lowers the pH and inhibits the growth of the bacteria. It replaces all the oxygen that causes the food to spoil. Therefore food remains safe for longer period.

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it prevent food from spoiling thats why N2 is used

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