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【英语时差8,16】液态气的燃点

时间:2015-12-31 06:21来源:互联网 提供网友:yajing   字体: [ ]
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Flash Points 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 fumes1 from a liquid can be ignited with a spark. 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 Fahrenheit2. 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. 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 vapor3 that could ignite if a lit match passed through it. Cod4 liver oil has a flash point of 412 degrees Fahrenheit and formaldehyde has a flash point of 122 degrees. Most flash points are inconsequential to the lay person because they occur at such high temperatures. But some, like kerosene5, 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.


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1 fumes lsYz3Q     
n.(强烈而刺激的)气味,气体
参考例句:
  • The health of our children is being endangered by exhaust fumes. 我们孩子们的健康正受到排放出的废气的损害。
  • Exhaust fumes are bad for your health. 废气对健康有害。
2 Fahrenheit hlhx9     
n./adj.华氏温度;华氏温度计(的)
参考例句:
  • He was asked for the boiling point of water in Fahrenheit.他被问到水的沸点是华氏多少度。
  • The thermometer reads 80 degrees Fahrenheit.寒暑表指出华氏80度。
3 vapor DHJy2     
n.蒸汽,雾气
参考例句:
  • The cold wind condenses vapor into rain.冷风使水蒸气凝结成雨。
  • This new machine sometimes transpires a lot of hot vapor.这部机器有时排出大量的热气。
4 cod nwizOF     
n.鳕鱼;v.愚弄;哄骗
参考例句:
  • They salt down cod for winter use.他们腌鳕鱼留着冬天吃。
  • Cod are found in the North Atlantic and the North Sea.北大西洋和北海有鳕鱼。
5 kerosene G3uxW     
n.(kerosine)煤油,火油
参考例句:
  • It is like putting out a fire with kerosene.这就像用煤油灭火。
  • Instead of electricity,there were kerosene lanterns.没有电,有煤油灯。
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