为什么蜡烛本身不能燃烧,需要用芯线才能燃烧?

2025-01-20 22:19:47
推荐回答(5个)
回答1:

其实石蜡本身就能燃烧,不过它的燃点比熔点(严格说石蜡是非晶体,无熔点)高,所以要先提供大量的热将蜡熔化了以后才能燃烧起来。
而加了灯芯后,只需要熔化灯芯上的少量石蜡,所以很容易点燃了。然后燃烧后产生的热量不断熔化周围的石蜡,使燃烧继续下去。
没电以前曾用石蜡照明,将石蜡放在一个铝饭盒里,只是用布拈了个灯芯,因为灯芯太粗,最后整盒石蜡都燃了起来!

蜡单独存在的时点不燃这是因为在燃烧过程中,还包括一个蜡油气化的过程,若没有气化,液态蜡油是会把火弄熄的!在蜡烛或油灯的烧燃过程中,燃油都是藉毛细作用,自油槽中沿烛芯向上送到火焰燃烧的部分,当燃油抵达上端时,就开始气化。 毛细作用力把燃料带到可燃烧之处,而且储存在那里。

回答2:

楼主是个喜欢思考的人!!这个问题问的相当好! 我想了很长的时间! 这个不仅仅是一个生活的问题,其中包括着智慧和哲学! 不是我故意这么说,你来听听我的分析!仅仅是个想法!
首先石蜡是可以燃烧的,这点是肯定的。 为什么要有灯心。主要的目的在于控制! 只有控制才有意义! 楼上说的好,将石蜡放入火堆,它的确是燃烧了,但是没有意义。有了灯心,燃烧的石蜡只能在灯心的附近,只能燃烧灯心中所毛细进去的液态蜡和灯心附近的石蜡,这个是一个能量的缓释。需要大火苗,就把灯心放长,需要小火苗,就剪短灯心。
其实,真正能为我们服务的,都是这样的道理。 只有控制才有意义! 无论什么! 人们很聪明,仅仅 用一条棉绳就解决了夜晚取亮的问题。简单的,才是经典的!

回答3:

芯线燃烧使蜡烛达到燃点,蜡烛就靠芯线燃烧提供的温度以燃烧本身。而“二是使固体的蜡烛熔化渗透到芯线里与空气充分接触”,这个不敢苟同。

回答4:

主要是灯芯的燃烧,蜡烛有部分燃烧了,它的主要作用是延缓灯芯的燃烧,使之能够维持更久的时间

回答5:

灯心的燃烧放出的热量使粘在灯芯上的蜡达到腊的燃点,从而使粘在灯芯上的蜡燃烧,同时燃烧放出的热量使蜡熔化,吸附在灯芯上继续燃烧。

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