Why does fruit retain heat when cooked?
Fruit – Why does cooked fruit seem to retain more heat than the other foods in the recipe
fruittemperature
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Best Answer
The same phenomenon occurs with tomato sauce on pizza, or vegetables in a casserole: the moist filling feels much, much hotter than surrounding crust or noodles.
In short, this phenomenon is caused by differing thermal properties of the materials involved. The quoted excerpts below (from PhysLink.com) provide some explanation of the physics involved, and I've attempted to extend and simplify it a bit more.
Imagine an apple pie fresh out of the oven:
Pie crust has lower thermal conductivity, since it has less water in it and more pockets of air (even small ones) and the heat energy is not conducted through it as easily.
In contrast, the fruit filling (which is relatively full of water) has a higher thermal conductivity, and can more easily transfer its stored heat to your mouth.
Either hot pie crust or hot fruit filling can burn your tongue, but the hot fruit filling will burn you more quickly.
The specific heat capacity is a bit trickier to understand, but it essentially means that the filling (remember, full of water) absorbs more energy to reach the same temperature and therefore has to transfer more heat energy (either to the air or to your mouth) to cool down compared to the crust, with lower heat capacity.