珍珠湾ART

标题: 火苗怎么被斩断了？ [打印本页]

作者: LOTUSEATER 时间: 2006-11-22 00:40
标题: 火苗怎么被斩断了？

点燃一支蜡烛，火苗很长很旺。这时你拿一片铁窗纱，平放在蜡烛火苗的中间。奇怪，窗纱上面的蜡烛火苗怎么被斩断不见了？火苗为什么穿不过窗纱的小孔在上面继续燃烧呢？

多嘴﹕要是有在家試驗的小心點﹔別玩著燒了其他的物件

本贴由[LOTUSEATER]最后编辑于：2006-11-21 17:18:47

作者: yma16 时间: 2006-11-22 06:02
标题: 回复：火苗怎么被斩断了？

火苗 has the minimum volume. It cannot pass 窗纱 when the holes are too small.

作者: 花心石 时间: 2006-11-23 06:24
标题: 回复：火苗怎么被斩断了？

我还以为是热量被铁窗纱散掉了，所以上面不够燃点呢。

www.ddhw.org---

作者: ob 时间: 2006-11-23 09:06
标题: That is my understanding too.

That is my understanding too.

作者: salmonfish 时间: 2006-11-24 01:05
标题: 回复：火苗怎么被斩断了？

Generally speaking, free flame contains mainly two types of energy, i.e., visible light (color) and invisible light (infrared). The heat we feel from a candle light is the infrared light or radiation part, while the visible light (the color) of a candle flame is, in fact, emitted from the excited carbon ATOMS, resulted from an incomlete combustion of the carbon containing fuel, i.e., the candle.

When a metal net is put above the candle flame, the infrared part of the light will pass the net, perhaps with some kind of turbulence, but the excited carbon atoms will be quenched and captured by the metal net. Above the net, there is no more excited carbon atoms, therefore, there is no more color can be seen. Then, where are those quenched carbon atoms? They have been deposited on the metal net as "carbon black" or "Guo Hei". It will make your finger black as you touch the net after it has been cooled down.

However, if the candle light is too "strong" you may see some of the carbon deposited on the net will be blowed off above the net and re-burned, resulting some flying sparks above the net.

Sorry I don't have Chinese input software.

Cheers

欢迎光临珍珠湾ART (http://66.160.158.134/)