FOOD PROCESSING AND PRESERVATION
FOOD PRESERVATION METHODS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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freezing
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microwaving
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refrigerating
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canning
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Detailed explanation-1: -Heat transfer by natural convection takes place by conduction through a stagnant film of liquid on the inside surface of the can.
Detailed explanation-2: -Conduction. The heating of solids also brings about differences in density. Because movement of solids is impossible, convection currents alone cannot be used for canning. Heating through conduction must also take place.
Detailed explanation-3: -The term processing as used in canning technology, means heating of canned foods (fruits, vegetables and other food stuffs) to inactivate bacteria. This is also called as retorting.
Detailed explanation-4: -Conduction is the process of heat being transferred between objects through direct contact, and it’s the most common type of heat transfer. For example, in cooking the burners on stoves will conduct heat energy to the bottom of a pan sitting on top of it. From there, the pan conducts heat to its contents.