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7
  • Plastic wrap is usually about 12.5 um thick (0.5 mils). If you stretch it much thinner than that it'll start passing more water. That'll cause your food to dry. en.wikipedia.org/wiki/Plastic_wrap Apparently testing water permiability of various plastic films is a popular science fair project, so real numbers are hard to find. With decent commercial films, and reasonable fridge times, it's not usually a problem. Commented May 5, 2014 at 11:42
  • @WayfaringStranger It is well known that thin plastic wrap--or even some of the less expensive zip type bags--are permeable. But given the specific example of Tupperware in the question, I didn't take drying to be the meaning intended. :-) There, it still reduces drying compared to no covering at all :-) Commented May 5, 2014 at 11:48
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    @SAJ14SAJ : you seem to like taking the 'argumentum ad ignorantiam' route -- just because you can't prove it's true, it must not be true. This might not be such a problem, but you answer so many questions on this site within an hour of them being posted, if you have a constructive answer or not. Some of your answers seem to be 'I found this through internet research' (you make comments suggesting you're not an expert on the topic, then you write an expert-sounding answer, but this one is an 'I didn't even bother to look because I assume it to not be true'. Commented May 5, 2014 at 11:57
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    @SAJ14SAJ : you can't do a comprehensive search in under an hour. What were you using? Web of Science? Google Scholar? Or just Google web search? 2nd hit under Google Scholar for 'meat plastic storage' was Microbial spoilage of luncheon meat prepared in an impermeable plastic casing. Fifth was The Effect of Film Permeability on the Storage Life and Microbiology of Vacuum‐packed meat Commented May 5, 2014 at 12:07
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    @SAJ14SAJ : JSTOR now has a program where you can read a few articles free, if you register. Also, it's possible that some of the biological process articles would be in NIH's PubMed Central, which are all free. Due to an OSTP memo last year, research done using money from most US federal agencies will have to be made freely available in the future. Commented May 5, 2014 at 12:19