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灭火器是扑灭初期火灾的重要工具。但不同的燃烧物质,使用的灭火器也不一样。有的灭火器能灭这种物质的火灾,而不能灭另一种物质的火灾;有的不仅不能灭火,还会使火势扩大蔓延。例如:清水灭火器、酸碱灭火器,可以扑灭木材、塑料等物质的火灾,但在扑救金属钾、钠等物质的火灾时,不仅不能扑灭,反而会使火势迅速蔓延扩大,因为这些金属能与水发生剧烈的化学反应,
Fire extinguishers are an important tool to extinguish an initial fire. However, different combustion substances, the use of fire extinguishers are not the same. Some fire extinguishers can extinguish this kind of material fire, but can not extinguish another kind of material fire; some can not only extinguish the fire, but also make the fire spread and expand. For example, water fire extinguishers and acid-base fire extinguishers can extinguish fires of wood, plastic and other substances. However, when fighting fires of metals such as potassium and sodium, not only can they not be extinguished, they can rapidly spread and expand because the metals can react with water A violent chemical reaction occurs,