Materials with permanent dipole moments (or induced moments) absorb radiation much more readily than those with no or weaker moments. That is why, for example, that water and CO2 (permanent and induced dipole moments, respectively) absorb more infrared radiation and are greenhouse gases while oxygen and nitrogen (no dipole moment) absorb very little radiation and are not greenhouse gases.
Materials with permanent dipole moments (or induced moments) absorb radiation much more readily than those with no or weaker moments. That is why, for example, that water and CO2 (permanent and induced dipole moments, respectively) absorb more infrared radiation and are greenhouse gases while oxygen and nitrogen (no dipole moment) absorb very little radiation and are not greenhouse gases.
Because of permanent dipole moment materials have more free electrons than induced dipole moment. So, permanent dipole moment materials have more conductivity than that of induced dipole moment. More conductivity has more heating. Am I right?
this book can help you .Good luck
The Essence of Materials for Engineers
Robert W. Messler Jr.
The issue is not free electrons. It is the ability of an electromagnetic wave to interact with a gas molecule. If the gas molecule has a dipole moment, either permanent or induced, it creates a local electric field which affects the light wave or microwave (electromagnetic wave) as it passes through. Free electrons also couple with light waves because they are so mobile, but all that is required is that there is some local phenomenon that affects the light wave. If there is not local field, the interaction is much smaller. Electromagnetic waves with a frequency similar to a resonant frequency of the molecule (typically a vibration-rotation frequency) very strongly interact with the molecule, which leads to light absorption and heating.
Respected sir,
I am thankful for your valuable response. You suggest about gases, how they interact with microwave. Is it also true for metals and polymers. How metals and polymer behave, when they interact with microwaves in terms of heating.
The same is true for polymers. Metals have the additional property of free electrons. The oscillating field of the approaching microwave mobilizes the free electrons in metals, which in turn generates another electric field. Their interactions result from these fields interacting. This mobile electrons are what give metals their reflectivity.
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