why microwave oven does not heat up the vessels?

Microwave ovens heat food by using electromagnetic radiation in the microwave range. This radiation causes water molecules in the food to vibrate, generating heat. However, metal vessels do not allow microwaves to penetrate them, so they do not heat up.

Here are the reasons why microwave oven does not heat up the vessels:

- Reflection: Metal surfaces reflect microwaves, so they do not allow microwaves to enter the vessel.

- Absorption: Microwaves are absorbed by water molecules, but metal does not contain water molecules, so it does not absorb microwaves.

- Conduction: Metal is a good conductor of heat, so any heat that is generated on the surface of the metal vessel is quickly conducted away, preventing the vessel from heating up.

Therefore, microwave ovens are not suitable for heating metal vessels.