Define dehydration. Explain theories of drying and dehydration. What are the advantages of dehydrated fruits and vegetables? Enlist common types of driers used for drying of fruits and vegetables.

Dehydration is the process of removing water from fruits, vegetables, or other food products to extend their shelf life, preserve nutritional value, and reduce volume for easier storage and transportation. This process involves the controlled removal of moisture from the produce, preventing microbial growth, enzymatic reactions, and spoilage that occur in the presence of water.

There are two primary theories of drying and dehydration that explain the processes behind moisture removal from food:

1. The Heat Transfer Theory: This theory suggests that drying occurs due to the application of heat, which increases the temperature of the food product. The heat causes water molecules in the food to vaporize and move to the surface, where it ___ ___ _____ _____ __________ _____ _______ _______ _______ ______ ___.
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