蘋果批外冷內熱 (20)

2010-06-12 9:27 am
is this phenomenon related to the high specific heat capacity of water? explain fully plz~

please note the structure of the apple pie, the outer is crust (酥皮) and inner is fillings (the type that u can find in McDonalds')
更新1:

i agree with you, big ben wang but, it is just what my textbook says.. if we try to use specific heat capacity to explain this phenomenon, what will we see?

更新2:

marco: what if there is not enough time for the crust to become hot? then, it shows that the crust is insulating moreover, i think the specific heat capacity of water is higher than that of the crust

回答 (2)

2010-06-12 5:27 pm
✔ 最佳答案
it is true that the heat capacity of water is relative high yet in this issue, however, in my opinion, it is the crust that act like an insulating layer that helps to protect the heat lost from the inside.

this is the same when you were in the cold area, if you are insulating probably, under an infrared camera, the outside is cold, yet the insulating layer keeps you warm!

2010-06-15 13:18:45 補充:
I don't agree with Marco,

if the heat capacity of crust is high, then it should remain hot instead of cold.

the heat capacity of crust is low, because it is full of air, as a result of deep fried, since it is full of air, it act as a good insulating layer.

2010-06-15 13:21:35 補充:
"The crust has HIGH specific heat capacity, so it requires a lot of energy to rise its temperature."

when the pie came out of the oven, or oil, the surface is hot, and if the crust heat capacity is high, then the crust should remain hot, oppositely, it cool down very quickly,

2010-06-15 13:21:55 補充:
it does not have high heat capacity!
2010-06-12 11:33 pm
It is related to specific heat capacity, but not necessarily related to specific heat capacity of water.

It is related to the specific heat capacity of crust.

The crust has HIGH specific heat capacity, so it requires a lot of energy to rise its temperature.

As the temperature of the inner filling is not high enough to rise the crust's temperature, the crust remains "cool".
參考: myself!


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