有關convection與conduction

conduction , convection 同 radiation 都有~

conduction:
用手指直接接觸熱水, 當然有conduction

convection:
當你heat up d 水, 熱既水會向上升 凍既水向下降, 形成左一個
convection currect. 所以你手指就feel 到熱la~
因為當水變熱既時候, 密度會變低, 水所以會變輕, 之後就升上水面, 取代左上面戈層凍D 既水.
凍D 既水相比起熱D 既水就會變得重D同密度高D, 所就SINK 左去水底.
只要不斷咁循環, 水就會變熱LA~

radiation :
當你放雙手指入去, 你都會感到熱, 因為有微量既輻射.

2009-06-07 12:34:19 補充：
希望係最佳答案.

2009-06-07 12:35:28 補充：
如果都唔明, 可以去維基度揾吓, 入面D INFO 好詳細

It should be "conduction", which is the main transfer process of heat from the water to your finger.

It is simply because your finger is in direct contact with the hot water, so makes conduction a major process of heat transfer.

Convection only concerns with heat transfer in liquid substance, such as water, and is not concerned with your finger which is a solid.