火是人类最早的光源,几个世纪以来不同形式的火照亮了人们的道路。火把是人类造出的可携带光源。第一支火把是将棍子捆绑在一起并点燃一头做成的。后来人们把在油里浸泡过的碎布捆在棍子的一头以制造长时间燃烧光源(当时使用的是植物油或动物油脂,直到1860年石油才被广泛使用)。浸透在碎布里的油发生了一种所谓的毛细作用,液体渗透 Fire is the earliest source of light for humans, and different forms of fire have lightened people’s path for centuries. The torch is a portable light source that humans create. The first torch was made by binding sticks together and lighting one end. Later, people tied the rags soaked in oil on one end of the stick to create a long-term light source (vegetable oils or animal fats were used until petroleum was widely used in 1860). Soaking in the oil of the bristle causes a so-called capillary action, liquid penetration