Give me example of rancidity

An example of rancidity is when a chips pack is exposed to atmospheric air which results in a change in taste and odor.

Explanation:

Rancidity is a condition in which the substance with oil and fats get oxidized when they are exposed to air. A substance is said to be rancid when there is a change in smell, taste, and colour.Oil becomes rancid due to decomposition of fats it contains or sometimes milk becomes rancid due to not heating it in humid atmosphere, etc.