Define rancidity. To prevent rancidity of food containing oils and fats, some substances are added to them. What are these substances called ? some other methods to prevent rancidity.

Explanation

Rancidity is the slow process where the oils and fats present in food are oxidized when exposed to oxygen, leading to foul smell and a bad taste.
Different methods used to prevent rancidity are :
(a) Adding chemical called antioxidants, which prevent or slow down the oxidation process.
(b) Storing foods in airtight containers or in a refrigerator.