When food containing fat or oil is not used and left for a long time, their smell and state changes.Name the process which is responsiblefor this change . List two methods to prevent or slow down the above change.

When food containing fat or oil is not used and left for a long time,

1.	When food containing fat or oil is not used and left for a long time, their smell and state changes.Name the process which is responsiblefor this change . List two methods to prevent or slow down the above change.
Answer» Solution :When food contaningfat or oil is not used and left over for a long time, their smell and state changes because FATS and OILS are getting slowly oxidised . This processis CALLED rancidity. Two METHODS which are used to slow down the oxidiation process are : (i) keeping food in airtight CONTAINER (ii) Flushing the bags containing food with nitrogengas.