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将一块普通的棉布浸在氯化铵的饱和溶液中,片刻之后,取出晾干就成防火布了.将这块经过化学处理的布用火柴点,不但点不着,而且还冒出白色的烟雾.经过这种化学处理的棉布(防火布)的表面附满了氯化铵的晶体颗粒,氯化铵这种化学物质有个怪脾气,就是特别怕热,一遇热就会发生化学变化,分解放出两种不能燃烧的气体:氨气和氯化氢气体.
A piece of ordinary cotton cloth was immersed in a saturated solution of ammonium chloride. After a while, it was taken out and dried to form a fireproof cloth. Using this chemically treated cloth with a match point, not only was it left blank, but also a white smoke. The surface of this chemically treated cotton cloth (fire-retardant fabric) is covered with crystal particles of ammonium chloride. The chemical substance ammonium chloride has a strange temper, which is particularly fearful of heat, and chemical changes occur when it is heated. Separation of the two incombustible gases: ammonia and hydrogen chloride gas.