Due to the wide use of plastic bags as containers for almost everything in everyday life, I naturally use them to wrap and hold dirty diapers as a temporary stop before getting to throw them in the garbage outside. However, these bags do not stop the smell from spreading around the bags at all.
I wonder why is that?
These bags seem to be tight enough to hold liquids (when intact), but they do not hold smells at all. I guess the obvious answer is that the plastic\nylon polymers have wide enough gaps between them for the passage of small clusters of molecules in the micro- or nano-level, but I was wondering if there was some other explanation and if anyone could elaborate on the matter.