Infrared ray is a wave with lower frequency than visible light, and its penetration is low. Generally, it acts on the surface of an object to heat it up, that is, only the surface of the object is heated, and then it is transmitted to all places by the object itself. Infrared exists in all aspects of life. As long as there is temperature, it will radiate infrared to the outside world, but the amount is different, which generally does not do much harm to the human body (the human body can feel and avoid harm). Infrared heating belongs to radiation heating.

Microwave is mainly used in microwave ovens, and it is a kind of electromagnetic wave with high frequency (household microwave ovens generally use 2.4G Hz, which is generated by magnetron and is invisible, higher than visible light and ultraviolet light). It acts on some molecules (such as water molecules and fat molecules), causing them to generate high-frequency vibration, friction and heat (internal heat), which has certain penetrability (nonmetal is about 4cm, and metal will not absorb and reflect microwave). Microwave leakage is harmful to human body. Microwave heating is actually.

It can be seen that microwave and infrared are very different, and the heating principle is different.