Claim: Food dehydrators require heat sources such as solar energy, electric power or biofuel to preserve and extend the length of time that a commodity may be stored without becoming unfit for use of various foods.
Evidence: Food dehydrators require heat sources such as solar energy, electric power or biofuel, and vary in form from large-scale dehydration projects to do-it-yourself projects or commercially sold appliances for domestic use. Thus, food dehydrators are used to preserve and extend the shelf life of various foods. Shelf life is the length of time that a commodity may be stored without becoming unfit for use, consumption, or sale.