HUMAN NUTRITION

Detailed explanation-1: -Anything made of or containing steel, iron, copper or other hard metals should never go in your microwave. Metal surfaces reflect microwaves, which increases the heat inside the appliance and could lead to a fire.

Detailed explanation-2: -The microwaves will not penetrate the metal; they can, however, induce an electric current in the bowl which is likely to have no consequence unless the metal has jagged edges or points. Then “arcing” can occur and sparks will fly.