熱學的問題

暖爐的外殼最好係深色(黑色),because black surfaces are good at emitting radiation(能有效地發放radiation).Therefore,it helps to facilate heat loss(transfer to surroundins) through radiation.

我都未見過有暖爐黑色ge.....
其實應該用淺色，因為咁樣就算關了後都仲會熱多一陣
至於雪櫃都係淺色..但係你又冇答...