Answer:
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Step-by-step explanation:
Well the air is not a good thermal contactor(same applies to sound).So by pumping it into 2 sheets a material(f) you prevent heat from going to the material and therefor to the green housr.All in all thr air acts as an insulation layer.I hope I was helpful.If you have any questions do not hesitate to contact me.
Yours sinerely,
Manos