why is vessel made up of metals like Al not kept in a microwave oven?????what will happen if one did so???? PLS EXPLAIN!!!

Dear student,

Any metal object that you put in the oven will become an antenna, converting microwave energy to oscillating electric currents within the metal object, and converting the energy of oscillating electric currents back into microwaves. The strength of the current in the metal object depends in very complex ways on the precise shape of the object.