Question

now a days wafers and other food is suppled in air tight what is the reason behind it

Answer 1

☆HEY MATE HERE IS YOUR ANSWER☆
Nowadays wafers and other food products are packed in air becuz the air filled in are inert gases like nitrogen these gases do not react with substances and keep our food safe.
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Answer 2

here is your answer
now a days wafers and other food is supplied air tight because if not done so they absorb moisture and hence get soft which are no longer liked