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A food dehydrator is simply used to dry food for preservation. Food preservation has been around for centuries, but with the recent technology advances anyone can dehydrate food in the comfort of their own home fairly easily. Food dehydrators use a fairly simple process to dehydrate the food. Mainly it is taking the moisture out of the food and slowing down the enzymes that trigger the growth of bacteria, mold and yeast. A food dehydrator is a small electrical appliance for drying foods indoors. A food dehydrator has an electric element for heat and a fan and vents for air circulation. Dehydrators are efficiently designed to dry foods fast at 14 degrees Fahrenheit. Food dehydrators are available from department stores, mail-order catalogs, the small appliance section of a department store, natural food stores and seed or garden supply catalogs. Costs vary depending on features. Some models are expandable and additional trays can be purchased later. Twelve square feet of drying space ...
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The main function of a food dehydrator is actually very simple. A food dehydrator is designed to remove a significant amount of water from food. The water content of food is generally very high, typically between 80% to 95% for various fruits and vegetables and 50% to 75% for different meats. Removing the moisture from food inhibits various bacteria, yeasts and molds from growing and spoiling it while also reducing the weight of the dehydrated food by approximately the amount of its water content pre-dehydration. Thus, food dehydrators are ideal tools for the preservation and storage of food.
http://www.food-dehydrator.com/resource-center/what-does-a-food-dehydrator-do.aspx
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What Is A Food Dehydrator?