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时差N小时:液态气的燃点

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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.

与化学药品打交道的人,总会确保自己知道实验室中每一种物质的燃点。燃点是液态气体能被火花点燃的温度。
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.
但未曾上过化学课的人同样需要关注物质的燃点。例如,你加入车里的汽油燃点是华氏零下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,除非你生活在温度维持在华氏零下45度以下的环境里,汽油逸出的烟雾才不会被附近的明火点燃。这也是为什么大多数加油站都张贴警告标志,告戒人们不要在给车加油时吸烟。
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.
橄榄油的燃点是华氏437度。这意味着如果你把橄榄油加热至437度,它散发出的蒸气完全可以被一根划过去的、燃着的火柴点燃。鱼肝油的燃点是华氏412度,而甲醛的燃点是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.
大多数物质的燃点对于业外人士来说不重要,因为它们只在高温条件下出现。但是,一些像煤油一样,燃点为华氏100度的物质,在炎热的日子里着实令人担忧。如果你的壁炉架上有一盏老式煤油灯,你最好不要在炎热的夏天点燃它,因为你点燃的可能不仅仅是煤油灯的灯芯。

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重点单词   查看全部解释    
liquid ['likwid]

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adj. 液体的,液态的
n. 液体

 
tank [tæŋk]

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n. 坦克,箱,罐,槽,贮水池
vt. 把 .

 
vapor ['veipə]

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n. 蒸汽

 
gasoline ['gæsəli:n]

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n. 汽油

 
inconsequential [in.kɔnsi'kwenʃəl]

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adj. 不合逻辑的,不合理的,不重要的

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substance ['sʌbstəns]

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n. 物质,实质,内容,重要性,财产

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concerned [kən'sə:nd]

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adj. 担忧的,关心的

 
wick [wik]

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n. 蜡烛芯,灯芯

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spark [spɑ:k]

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n. 火花,朝气,情人,俗丽的年轻人
vi.

 
ignite [ig'nait]

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vi. 着火,发光
vt. 点燃,使 ...

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关键字: 时差 燃气

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