The difference between a liquid and a gas is obvious under the conditions of temperature and pressure commonly found at the surface of the Earth. A liquid can be kept in an open container and fill it to the level of a free surface. A gas forms no free surface but tends to diffuse throughout the__1__available; it must therefore be kept in a closed container or held by a gravitational field, as in the__2__of a planets atmosphere. The distinction was a __3__feature of early theories describing the phases of matter. In the nineteenth century, for example, one theory maintained that a liquid could be dissolved in a vapor without losing its identity, and another theory__4 __that the two phases are made up of different kinds of molecules. The theories now prevailing take a quite different approach by emphasizing what liquids and gases have in __5 __They are both forms of matter that have no __6 __structure, and they both flow readily.
The fundamental similarity of liquids and gases becomes clearly apparent when the temperature and pressure are __7__somewhat. Suppose a closed container __8__filled with a liquid is heated. The liquid expands, or in other words becomes less dense; some of it evaporates. In contrast, the vapor above the liquid surface becomes denser as the evaporated molecules are __9__to it. The combination of temperature and pressure at which the densities become __10__is called the critical point.
A. added B. case C. prominent D. held
E. equal F. partially G. example H. previous
I. space J, lifted K. permanent L. particularly
M. extended N. raised 0. common
I. I 2. B 3. C 4. D 5. O 6. K 7. N 8. F 9. A 10. E
2016届高考英语(外研版 全国)一轮复习教学案:选修7Modules3-4
2016届高考英语(外研版 全国)一轮复习教学案:选修8Modules1-2
国办印发《生产者责任延伸制度推行方案》
2016届高考英语(外研版 全国)一轮复习教学案:必修2Module4
2016届高考英语(外研版 全国)一轮复习教学案:必修4Module3
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2016届高考英语(外研版 全国)一轮复习教学案:必修5Module1
2016届高考英语(外研版 全国)一轮复习教学案:必修2Module3
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2016届高考英语(外研版 全国)一轮复习教学案:必修2Module6
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2016届高考英语(外研版 全国)一轮复习教学案:必修5Module5
2016届高考英语(外研版 全国)一轮复习教学案:必修4Module1
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2016届高考英语(外研版 全国)一轮复习教学案:必修3Module6
2016届高考英语(外研版 全国)一轮复习教学案:必修3Module5
2016届高考英语(外研版 全国)一轮复习教学案:必修4Module2
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2016届高考英语一轮复习 语法专题 虚拟语气 外研版
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2016届高考英语(外研版 全国)一轮复习教学案:必修1Module1
2016届高考英语(外研版 全国)一轮复习教学案:选修7Modules5-6
2016届高考英语(外研版 全国)一轮复习教学案:必修5Module3
2016高考英语(江苏专用)全程复习方略 课时提升 作业七:Unit1 The world of our senses(牛津译林版必修3) Word版含解析
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