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The difference between a liquid and a gas is obvious (1)____ the conditions of temperature 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 (2)____ be kept in a closed container, as in the (3)____ of a planet’s atmosphere. The distinction was a prominent feature of early theories (4)____(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 (5) t____ a quite different approach by emphasizing what liquids and gases have in common. They are both forms of matter (6)____ have no permanent structure, and they both flow easily. They are fluids.The (7)____(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 (8)____, 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 (9)____ which the densities become equal is called the critical point. Above the critical point the liquid and the gas can no longer be (10)____(distinguish); there is a single, undifferentiated fluid phase of uniform density.
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更多 “问答题The difference between a liquid and a gas is obvious (1)____ the conditions of temperature 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 (2)____ be kept in a closed container, as in the (3)____ of a planet’s atmosphere. The distinction was a prominent feature of early theories (4)____(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 (5) t____ a quite different approach by emphasizing what liquids and gases have in common. They are both forms of matter (6)____ have no permanent structure, and they both flow easily. They are fluids.The (7)____(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 (8)____, 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 (9)____ which the densities become equal is called the critical point. Above the critical point the liquid and the gas can no longer be (10)____(distinguish); there is a single, undifferentiated fluid phase of uniform density.” 相关考题
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evaporationB
frostingC
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单选题The maximum difference between mean time and apparent time is ().A
equal to the longitude expressed in time unitsB
about 16 minutesC
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15°of arc
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solenoid valve to seizeB
compressor to huntC
formation of flash gas in the liquid lineD
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单选题The temperature () a liquid changes its state from liquid to gas depends upon the liquid itself and upon the pressure () it is subjected in the containing vessel.A
at which/to whichB
from which/at whichC
to which/from whichD
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单选题The static suction lift of a pump is the difference in elevation between the ().A
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centerline of the pump and the level of the discharge liquidD
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单选题The () is used to measure the volume of a liquid or gas through a pipeline within any given period of time.A
flowmeterB
viscometerC
micrometerD
feeler
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单选题The valve best suited for throttling gas or liquid flow in a pipeline is the().A
gate valveB
globe valveC
check valveD
plug cock
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pressureB
velocityC
flow rateD
temperature
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单选题What does the command show | compare rollback 1 display?()A
the difference between the current candidate configuration and the candidate configuration from one commit agoB
the difference etween the current active configuration and the active configuration from the one commit agoC
the difference between the current active configuration and the active configuration from one commit agoD
the difference between the current candidate configuration and the archived configuration from one commit ago
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listB
heelC
trimD
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单选题A wind has caused a difference between drafts starboard and port. This difference is().A
listB
heelC
trimD
flotation
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Height of the machineB
Temperature of the liquid sealC
Gravity discD
Bowl diameter
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单选题The heat required to change a substance from a liquid to a gas without experiencing a temperature change is defined as the latent heat of ().A
fusionB
vaporizationC
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单选题Forces within a vessel have caused a difference between the starboard and port drafts,This difference is called().A
listsB
heelC
trimD
flotation
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the solenoid valve to seizeB
the compressor to huntC
flash gas to form in the liquid lineD
the expansion valve to freeze open
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varies depending upon the bearing usedB
is the angular difference between magnetic north and compass northC
is published on the compass rose on most nautical chartsD
is the angular difference between geographic and magnetic meridians
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