On Thursday, October 31, 2013 4:42:40 PM UTC-4, pltrgyst wrote:
> On 10/31/13 12:34 PM, Helpful person wrote:
>
> >>>> Metal expands when heated. It will sort of push the sides out and
> >>>> flatten. Some pans are designed that way to allow for the expansion.
> >>>> A metallurgist can explain it better.
>
> >>> Rubbish.
>
> >> You say rubbish, yet you offer no better explanation. What does that
> >> make you? Explain or STFU
>
> > A physicist. I cannot explain what you state without observation, but your
> > explanation is incorrect.
>
> OK. I have two pans, one Griswold cast iron and one All Clad, which have
> warped -- viewed from the bottom, the cast iron is concave, and the All
> Clad is convex. Both flatten out on the cooktop after about five minutes
>
> of medium heat.
>
The most likely explanation is the creation and reduction of stress as the pan
heats and cools.

http://www.richardfisher.com