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 food products to preserve their quality and extend their shelf life. Dehydration can be achieved through various methods, such as air-drying, sun-drying, oven-drying, and freeze-drying. The goal of dehydration is to reduce the moisture content of the food to a level that is inhospitable to the growth of bacteria, yeast, and mold, which can cause spoilage. Dehydrated food products are lightweight, compact, and easy to store, making them ideal for use in emergency situations, long-term storage, and outdoor recreation. Some popular dehydrated foods include fruits, vegetables, meat, and grains.

There are several theories of drying and dehydration, including:

1. Diffusion Theory: This theory states that the drying process occurs due to the diffusion of water molecules from the interior of the material to its surface. The rate of drying is determined by the concentration gradient of water in the material, as well as the permeability of the material to water vapor.

2. Film Theory: This theory assumes that the drying process is controlled by the formation of a thin, continuous film of water ____ _____ _________ __________ __________ ______.
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