Lift up the rear of the Macbook helps cooling?

Hi,
Does lift up the rear of the Macbook helps cooling?
OR !
If the Macbook is a flat wood surface (Table) the Table get warm too, does the Macbook and the Tabel "share the hotness"?
is a flat surface better than lift the rear up?
I lift it up with a CD Case.
If you Lift the rear up you have a Airflow.

I've noticed that wooden desks seem to get hotter than metal surfaces -- wood seems to "hold" the heat more. My wood desk at home and the wood lapdesk I had would both get very hot with my MacBook, but when I used it at work on a metal filing cabinet or on a metal notebook stand, those didn't seem to get hot at all. The metal surfaces also appeared to keep the MacBook itself cooler.
As a result, I now use an iLap aluminum lapdesk instead of a wooden one. (It can also be used an a desk.) The aluminum stays completely cool, whereas the wood would get quite hot. I also put four round silicone pads on the bottom of the Macbook (they seem to be a bit thicker than the original "feet") that raise it up slightly for airflow and keep it from slipping on any surface.

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