The methods of food processing by covering the two major methods-

• thermal processing
• dehydration. 

Food processing methods which include  freezing, microwave processing, irradiation, fermentation, deep fat frying and use of salt, sugar and chemicals as preservatives.  What is freezing and the different types of freezing systems available for foods?  How do microwaves help to process and preserve food? How can simple home-based methods such as deep fat frying and use of salt, sugar and chemicals act as a preservative technique/measure.