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
外语
Heat loss by sweating depends on the fact that when a liquid evaporates, it absorbs an enormous quantity of heat from its surrou
Heat loss by sweating depends on the fact that when a liquid evaporates, it absorbs an enormous quantity of heat from its surrou
admin
2011-01-05
48
问题
Heat loss by sweating depends on the fact that when a liquid evaporates, it absorbs an enormous quantity of heat from its surroundings. Therefore, when 1 ml. of sweat evaporate, a great deal of heat is absorbed from the surface of the body in contact with it. This heat transfer occurs even if the environment is hotter than the body.
Two factors affect the rate of evaporation of sweat, and therefore the effectiveness of sweating as a method of cooling the body. The first is the amount of movement of air surrounding the body. The second is the amount of water vapor in the air that surrounds the body.
When air moves over the surface of water, the amount of evaporation is greatly increased. For this reason, sweat evaporates very rapidly on windy days, and the rate of heat loss by sweating is much more than on a still day. This accounts for the fact that hot still days are much less comfortable than hot windy days. In contrast, the sweat evaporates very rapidly on hot windy days, and cools the body quickly and effectively.
The second factor is the amount of water vapor in the air--the humidity. When air is carrying the maximum amount of water vapor that it can hold, it is said to be 100% saturated with water vapor. The relative humidity of the air is said to be 100%. Under these conditions the air cannot carry any water, so no water can evaporate. When the relative humidity is high, therefore, sweat cannot evaporate. Instead, it forms large drops and runs off your skin without cooling you.
When the air is very dry and carries no water at all, the relative humidity is said to be 0%. It is obvious that under these conditions, evaporation will be much more rapid. Therefore, sweating will be much more effective as a method of losing heat from the body. On a hot dry day, sweat evaporates as soon as it is formed, and you feel reasonably cool even though the temperature of your environment is very high.
______ The heat transfer happens on the condition that the environment is cooler than the body.
选项
A、T
B、F
C、NG
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/e1VK777K
本试题收录于:
C类竞赛(非英语专业本科)题库大学生英语竞赛(NECCS)分类
0
C类竞赛(非英语专业本科)
大学生英语竞赛(NECCS)
相关试题推荐
(1)Lisabeganwalkingupthesteephillleadingfromthegroupofshackswhereshelived.Sheworeasmall,fadedgreenhatwith
WhenBarackObamafirstranforpresident,EmmaHamiltonwaspartoftheworkingclass.Ms.Hamiltonworkedasaloaderatafac
WhenBarackObamafirstranforpresident,EmmaHamiltonwaspartoftheworkingclass.Ms.Hamiltonworkedasaloaderatafac
Itisnotsurprising,【C1】________thelackoffitbetweengiftedstudentsandtheirschools,thatsuchstudentsoftenhavelittl
Thinnerisn’talwaysbetter.Anumberofstudieshaveconcludedthatnormal-weightpeopleareinfactathigherriskofsomedis
(1)AmassiveearthquakestruckHaitijustbefore5p.m.onJan.12,about10milessouthwestofPort-au-Prince,thecountry’sc
Highereducationisn’tforeveryone,andpeoplehaveavarietyofpathstochoosefrom【T1】________.Theymightknowfromthesta
Goodmorning,ladiesandgentlemen.ItiswithagreatpleasurethatIwelcomeyoutothenewMuseumofIndustrialandRuralLif
Onlyaftertalkingtotwostudents________thathavingstrongmotivationisoneofthebiggestfactorsinreachinggoals.
LOOKONTHEBRIGHTSIDEDoyoueverwishyouweremoreoptimistic,someonewhoalways【16】ex______tobesuccessful?Havings
随机试题
确定生产计划的前提是销售预测,即需要对未来的销售情况作出估计。()
控制图不仅对判别质量稳定性、评定工艺过程状态以及发现并消除工艺过程的失控现象有着重要作用,而且可以为质量评定提供依据。()
人类所有需要中最基础、最重要的是()
护理健康教育学相关理论包括
最常见的早期输血并发症是
根据《水利水电工程标准施工招标文件》,若监理人对以往的检验结果有疑问时,可以指示承包人重新检验。若重新检验结果证明这些材料和工程设备符合合同要求,则重新检验的费用和工期延误责任应由()承担。
空气中粒径小于10微米的颗粒物能通过呼吸进入人体肺部,特别是小于2.5微米的细粒子还会被吸收到人体血液和淋巴液中。我国空气质量报告中的“可吸入颗粒物”是指()。
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性。()
A、B、C、D、()A
Itisimportantthatthereport______tothegeneralmanageratonce.
最新回复
(
0
)