The increase in temperature is the main sign of increasing the energy of matter molecules.
And microwave power is all card closed state, the speed of light into the object inside, immediately into heat, to save a long time heating heat loss, which is the principle of microwave heating energy.
Heating environment, generally can not be very strict adiabatic closed, in a very long heating time, it may be a lot of heat on the environment.
Traditional heating of solid materials must be in a heated environment, and then from the table and the inside, gradually into the internal solid, to obtain the conditions of heat balance, which takes a long time.
This is the principle that microwave can form both inside and outside the same time.
Electromagnetic waves are propagated at the speed of light, and the velocity of the electromagnetic wave penetrating substance is close to the velocity of the velocity of the light. The time of converting the energy of the electromagnetic wave into the energy of the material molecule is approximately instantaneous and the conversion time in the microwave band is faster
