G'day all,
I see it as being an impervious layer to keep the "baddies" out and to stop 
the food from spoiling (eg the biscuits, or bikkies here in Australia), thus 
keeping the food "fresher" for longer.

----- Original Message ----- 
From: "Alan B. Pearce" <A.B.Pearce@rl.ac.uk>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Thursday, August 28, 2008 5:25 PM
Subject: Re: [OT] Keep food fresh by wrapping it


> >I could see how cling film might have a more-than-non-negligible
>>effect on the air flow -- but when I think of a
>>pack of biscuits sitting in a cupboard,
>
> It is not the air flow, the cling film is keeping the moisture out that
> makes the biscuits go soft.
>
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