首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
专升本
When the temperature of a liquid is raised enough, the liquid boils. This means that bubbles of vapor, containing millions of mo
When the temperature of a liquid is raised enough, the liquid boils. This means that bubbles of vapor, containing millions of mo
admin
2011-04-26
66
问题
When the temperature of a liquid is raised enough, the liquid boils.
This means that bubbles of vapor, containing millions of molecules, form below the surface.
In order for such bubbles to be produced, the pressure of the vapor inside them must be equal to the pressure of the air upon the surface of the liquid. If the air pressure is greater, the bubble will collapse. The boiling point of a liquid, then, is the temperature at which the vapor pressure of the liquid is equal to the atmospheric pressure upon the liquid at the surface.
The pressure of the atmosphere at sea level is about one kilogram per square centimeter. We call this pressure one atmosphere. The boiling point of a liquid, therefore, is the temperature at which its vapor pressure equals one atmosphere. The boiling point of water is 100 Celsius; of ethyl alcohol 78.5 Celsius; of mercury, 356.9 Celsius.
If the pressure on the surface of the water is reduced, the boiling point will be lower.
Now the higher up we go from sea level, the lower the atmospheric pressure becomes, since there is less air to press upon us.
Hence, while water boils at sea level at a temperature of 100 Celsius, its boiling point on a mountain three kilometers high is only 90 Celsius. Since the temperature of water does not rise as a result of boiling, it would take you longer to cook potatoes or carrots in boiling water on the mountain than it would at sea level.
Which one is the best title for the passage?
选项
A、Boiling Point of Liquids.
B、Three States of Water.
C、What Is One Atmosphere.
D、Temperature of Liquids.
答案
A
解析
本题为主旨归纳题。文章第一段介绍了液体沸腾的过程,第二段介绍了液体的沸点,第三段介绍了液体的沸点随着海拔高度的变化而变化。
转载请注明原文地址:https://kaotiyun.com/show/Q0qC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
侯方域是明末清初著名的()
Thefirstsailorpretendedtobeillbecausehewantedto______.Whenthecaptainknewasailorwasill,he______.
Wasthatapropertopic______onsuchaformaloccasion?
WhydidKathyAllenneedtofindherbirthmother?Whichofthefollowingstateshaveopenadoptionrecordlaws?
(Needlesstosay),itisanewversionoftheoldtaleofinnocentscallingforthevilforcestheycannotcontrol.
TheseaseparatesTaiwan______theChinesemainland.
InGuangzhou,capitalofSouthChina’sGuangdongProvince,GuangzhouBaiyunInternationalAirportresumeditsinternationalflig
Untiltwoyearsago,Clearing,IllinoiswasatranquilsuburbofChicago.Butresidentsgrewalarmedwhentheynoticedarmedtee
It’snearlyseveno’clockJack______behereatanymoment.
Theplanhadbeen______,whichmadehimveryangry.
随机试题
准确度就是仪表指示值接近()的准确程度。
总体
Onthesurface,AIDSappearstohavebarelytouchedAsiasofar,andthefewcasesreportedinvolvemainlyforeigners,femalean
对佝偻病的发病机制下列哪项描述是错误的
恒牙根尖发育完成的时间是()
根据十八届三中全会决定,关于政府的职责和作用的说法,错误的是()。
志愿者拒绝超出约定范围的志愿服务体现了志愿者的()权利。
机关合并时,全部公文应当随之合并管理;机关撤销时,需要归档的公文()。
设总体X~N(a,2),Y~N(b,2),且独立,由分别来自总体X和Y的容量分别为m和n的简单随机样本得样本方差SX2和SY2,则统计量服从的分布是________.
下列关于swith语句的描述中,正确的是()。
最新回复
(
0
)