水是最便宜、最常用的灭火剂,因为它能吸收很多热量并产生大量水蒸气冲淡空气中的氧气,故而灭火效果很好。如果比重比水轻,且不溶于水的液体着火,用水去扑灭时,就会扩大着火面积。如对汽油、煤油、香蕉水等,因此这类液体火灾就不能用水扑救。 Water is the cheapest and most commonly used extinguishing agent because it absorbs a lot of heat and produces a large amount of water vapor to dilute the oxygen in the air, so the fire extinguishing effect is very good. If the proportion of lighter than water, and water-insoluble liquid on fire, water to extinguish, it will expand the fire area. Such as gasoline, kerosene, banana water, etc., so this kind of liquid fire can not be saved with water.