How can an oven be used as a microwave oven?
Can't be used as a microwave oven. Oven and microwave oven work differently. An oven heats air through a heating element (usually an electric heating element or a gas burner) and transfers heat to food through natural convection. The microwave oven radiates microwaves to food, so that polar molecules in food vibrate and rub to generate heat, thus achieving the purpose of heating food.