Question

why does the milk that comes in packets not spoil

Answer 1

As any things which are in packets will not spoil before their expiry date because inside the packet they fill the nitrogen gas to preserve it in cool

Answer 2

dear friend the milk sold in packets does not get spoiled because it is pasteurized milk pasteurisation is the process in which milk is heated at extreme temperature and then suddenly cooled the milk does not get spoiled because the milk is pasteurized is a method of preserving milk
l think it's help you