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The difference between a liquid and a gas is obvious【46】______the conditions of temperatur

e and pressure commonly found at the surface of the Earth. A liquid can be kept in an open container and fills it to the level of a free surface. A gas forms no free surface but tends to diffuse throughout the space available; it must【47】______be kept in a closed container, as in the【48】______of a planet' s atmosphere. The distinction was a prominent feature of early theories【49】______(describe) 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 held that the two phases are made up of different kinds of molecules (分子). The theories now prevailing【50】 t______a quite different approach by emphasizing what liquids and gases have in common. They are both forms of matter【51】______have no permanent structure , and they both flow easily. They are fluids.

The【52】______(fundament) similarity of liquids and gases becomes clearly apparent when the temperature and pressure are raised somewhat. Suppose a closed container partially filled with a liquid is heated. The liquid expands, or in other【53】______, becomes less dense; some of it evaporates. In contrast, the vapor above the liquid surface becomes dense as the evaporated molecules are added to it. The combination of temperature and pressure【54】______ which the densities become equal is called the critical point. Above the critical point the liquid and the gas can no longer be【55】______(distinguish) ; there is a single, undifferentiated fluid phase of uniform. density.

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更多“The difference between a liquid and a gas is obvious【46】______the conditions of temperatur”相关的问题

第1题

The passage mainly discusses ______.A．the development of art historyB．the difference betwe

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A．the development of art history

B．the difference between general history and art history

C．what we can learn from art

D．the influence of artists on art history

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第2题

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B.gate

C.indifference

D.gap

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第3题

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The need of the hour is to enhance and _______(large) the scope of cooperation between nations.

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第4题

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A.To test the relationship betweenDaylight and aDisease of the glands common tobords

B.To test the relationship betweenDaylight and migration．

C.To test the relationship between migration and temperature．

D.To test the relationship betweenDaylight and changes in the season．

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第5题

The word "civil" in Paragraph 3 refers to wars that are______.A．long-lastingB．fought betwe

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B．fought between one part of a country and another

C．short but frequent

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第6题

sense: In contrast to reference, sense may be defined as the semantic relations betwe

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第7题

According to the passage, cutting trees to grow more food______.A．will widen the gap betwe

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A．will widen the gap between the developed and the developing countries

B．is but a short-term relief to the food problem

C．can hardly alleviate the shortage of food

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第8题

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B.To make smooth transitions between ideas.

C.To add more specific details and examples.

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第9题

______lie（s)between the boundary of Canada and the U. S. and serve（s)as the boundary betwe

______lie(s)between the boundary of Canada and the U. S. and serve(s)as the boundary between the two countries.

A．The Mississippi River

B．The Great Lakes

C．The Rocky Mountains

D．The Grand Canyon

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第10题

9：What is the passage mainly about？A.Similarities in the interpersonal relationships betwe

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