Based on observations of my own toaster, it seems to me that if a piece of bread contains a hole, then the part of the bread surrounding the hole heats up more quickly then the majority of the rest of the bread. Can anyone confirm a similar observation and/or explain this?
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$\begingroup$ I suspect that this is related to that a 90 degree edge around the bread hole has less volume of bread around itself to dissipate the incident radiative heat than a point on a flat bread-piece.. $\endgroup$– BjornWCommented Feb 8, 2015 at 11:26
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1 Answer
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Assume the bread is consisted of similar tiny tiny pieces, each having the same mass and surface. Also, assume there is a uniform heat flux everywhere.
The pieces close to a hole or at the sides of the bread have a larger portion of their surface exposed to heat, than a piece that is surrounded by other pieces, therefore they absorb heat at a faster rate.
This makes their temperature rise faster, and they start burning before the rest of the bread does.
