Food Preservation

The term food preservation refers to any one of a number of techniques used to prevent food from spoiling. The following are the general methods of food preservation:  application of heat, such as canning and preserving, pasteurization, evaporation, sun-drying, dehydration and smoking,  application of cold, as ill cold storage, refrigeration and freezing,  the use of chemical substances such as salt, sugar, vinegar, benzoic and lactic acids,  fermentation, examples being acetic, lactic, alcoholic, etc.,  such mechanical means as vacuum, filtration and clarification processes, devices or agents for preventing chemical deterioration or bacteriological spoilage (the use of oil, paraffin and water glass are included here),  combinations of two or more of the above.