英语翻译Before going outside in the morning,many of us check a w

英语翻译
Before going outside in the morning,many of us check a window thermometer for the temperature.This helps us decide what to wear to wear.We use and depend on thermometers to measure the temperature of many other things in our daily in our daily lives.We want our food to be a certain coldness in the refrigerator.We want our food to be a certain coldness in the refrigerator.We want it a certain hotness in the oven.If we don't feel well,we use a thermometer to see if we have a fever.We keep our rooms a certain warmth in the winter and a certain coolness in the summer.Not all the thermometers use the same system to measure temperature.We use a system called the Fahrenheit scale.But most other countries use the Centigrade scale.Both systems use the freezing and boiling points of water as their guide.They label these in different ways.On the Fahrenheit scale water freezes at 32 degrees and boils at 212 degrees.On the Celsius scale water freezes at 0 degrees and boils at 100 degrees.The most common kind of thermometer is made with mercury inside a clear glass tube.As mercury(or any other liquid)becomes hot,it expands.As it gets colder,it contracts.This is why on hot days the mercury line is high in the glass tube.Now that you know this rule you can make a thermometer of your own that will work.First.Take a clear glass juice bottle that has a cap;fill the bottle with coloured water.Tap a hole in the center of the cap using a hammer and thick nail.Put the cap on the jar.Then stick a plastic straw through the nail hole.Take wax(you may use an old candle if you have one)and melt some of it right where the straw is struck into the cap to seal them together.Finally,place a white card on the outside of the bottle and behind the straw.Now you can see the water lever easily.The water will rise in the straw.As the temperature of the air goes up,the water will expand and rise even higher.As the temperature goes down,the water will contract,and the level in the straw will come down.Perhaps you will want to keep a record of the water level in the straw each moring for a week.

我们很多人都会在早上出门之前看看窗台温度计的温度,以为我们提供穿衣参考.日常生活中,我们要使用并依靠温度计做很多其它事情.我们要实物保持在某个冷温或是在微波炉中保持某种高温.如果感觉不舒服,我们就用温度计测试一下,看看有没有发烧.我们的屋子要冬暖夏凉,不是所有的温度计都使用相同的指标测量温度.我们使用的是华氏温度,但其它多数国家实用的是摄氏温度.两个温度体系都以水的冰点和沸点作为指引.标记方式各不相同.华氏温度计中水在32度结冰,在212度沸腾；而摄氏温度计中水在0度结冰,在100度沸腾.最常见的温度计是在一个清洁玻璃试管内装有水银.当水银(或其它液体)变热时,自身就会膨胀.变冷时,就会收缩.这就是为什么在炎热天气中水银柱会很高.知道了这个原理,你就可以制作自己的温度计了.拿一个带盖子的果汁玻璃瓶,用有色水把瓶子填满.用锤子和大钉子在盖子的中间挖一个洞,然后把盖子盖上.拿一根塑料管,从中间的孔中伸进去.用蜡(可以用旧蜡烛)熔化,滴到孔的边缘密封.最后,在瓶子外面放一个白板在吸管后面,这样你就可以清晰地看到水位了.吸管中的水位会上升.随着空气温度升高,水位还会继续膨胀上升.而如果气温下降,水就会收缩,吸管中的水位就会下降.或许你可以把一周内每天早上吸管内的水位都记录下来.
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