Some plastics wraps are permeable to gases
(meaning they allow gases like air to pass
through) while some others are not. Aluminum foil
however, being a metal foil, has almost no
permeability, meaning that no gas (air) can
pass through. The reason why the plastic warp
allows air though has to do with the structure
of the plastic at the level of molecules (called
polymers) from which the plastic is made up.
Aluminum foil, being an amorphous metal,
would not allow air through. Plastic depends -
some plastics are permeable to air, and some
aren't. I don't know about plastic wrap that you
use in the kitchen.
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