physical question

2007-12-02 10:32 pm

A saucepan with a thick copper base contains water and is placed on a flat electric hot plate.
a)state the process by which energy is
1)transferred from the hot plate to the water,
2)spread through the water.
b)state one reason why the water would reach boiling point more rapidly with a lid on the pan.
c)the sides of saucepans are often polished.How does this reduce heat loss?

回答 (1)

Carson

2007-12-08 4:13 am

✔ 最佳答案

a1)Energy is transferred from the hot plate to the saucepan then to the bottom of water by conduction.
a2)Energy is spread through the water by convection.
b) With a lid on the pan, the pressure inside of the saucepan will increase and let steam escape much harder, then heat loos by evaporation is reduced, so the water would reach boiling point more rapidly.
c)The sides of saucepans are often polished to reduce heat loss by radiation.
I hope this can help with your understanding. =)

參考: Myself

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