Some plastics wraps are permeable to gases
(meaning they allow gases like air to pass
through) while some others are not. Aluminium 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 thouh has to do with the structure of the
platic 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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