Question

Why is the bag used for potato chips flushed with nitrogen gas

Answer 1

oil and fat containing substances usually oxidise faster.oxidation process is nothing but when food substances containing oils are kept open to air,their taste, smell and colour changes to abnormal.this should not happen to keep foods stay good for a long time.thus nitrogen which is an anti oxidant (does not let oxidation happen so faster but prevents )is added to make food stay good for a long time.