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People who work with chemicals make sure they know the flash point of each substance in their labs. A flash point is the temperature at which the fumes from a liquid can be ignited with a spark.
與化學藥品打交道的人，總會確保自己知道實驗室中每一種物質的燃點。燃點是液態氣體能被火花點燃的溫度。
But people who have never taken a chemistry course need to be concerned with flash points as well. For example, the gasoline you put into your car has a flash point of minus forty-five degrees Fahrenheit.
但未曾上過化學課的人同樣需要關注物質的燃點。例如，你加入車里的汽油燃點是華氏零下45度。
So, unless you live in a climate where the temperature stays below minus forty-five degrees, the fumes from gasoline can ignite from a nearby spark. And that’s why most gas stations have warning signs posted about not smoking while you fill up your tank.
所以，除非你生活在溫度維持在華氏零下45度以下的環境里，汽油逸出的煙霧才不會被附近的明火點燃。這也是為什么大多數加油站都張貼警告標志，告戒人們不要在給車加油時吸煙。
Olive oil has a flash point of 437 degrees Fahrenheit. That means if you could heat olive oil to 437 degrees, it would give off a vapor that could ignite if a lit match passed through it. Cod liver oil has a flash point of 412 degrees Fahrenheit and formaldehyde has a flash point of 122 degrees.
橄欖油的燃點是華氏437度。這意味著如果你把橄欖油加熱至437度，它散發出的蒸氣完全可以被一根劃過去的、燃著的火柴點燃。魚肝油的燃點是華氏412度，而甲醛的燃點是122度。
Most flash points are inconsequential to the lay person because they occur at such high temperatures. But some, like kerosene, with a flash point of 100 degrees Fahrenheit, can be cause for concern on a hot day. If you keep an old-fashioned kerosene lamp on your fireplace mantel, you probably shouldn’t light it on a hot summer day, or you might ignite more than just the wick of the lamp.
大多數物質的燃點對于業外人士來說不重要，因為它們只在高溫條件下出現。但是，一些像煤油一樣，燃點為華氏100度的物質，在炎熱的日子里著實令人擔憂。如果你的壁爐架上有一盞老式煤油燈，你最好不要在炎熱的夏天點燃它，因為你點燃的可能不僅僅是煤油燈的燈芯。
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