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
42
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.
______ You might expect the highest incidence of a heat stroke when the maximum temperature is 100 and humidity is 50%.
选项
A、T
B、F
C、NG
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/l1VK777K
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)Thelevelofdiscriminationhasvariedenormouslyinthehistoryofhumansocieties,fromgenocidewhereethnicsarekilledo
A.accompaniesB.automaticallyC.coupleD.goesE.indebtednessF.kindG.manner
Animalsarelivingcreaturesandmostofusoftenforgetaboutit.Althoughtheycan’tspeakourlanguage,theycanunderstandu
(1)You’rebusyfillingouttheapplicationformforapositionyoureallyneed;let’sassumeyouonceactuallycompletedacoup
We________donebetterundermorefavorableconditions.
(1)TherewasonceatownintheheartofAmericawherealllifeseemedtoliveinharmonywithitssurroundings.Thetownlayi
LOOKONTHEBRIGHTSIDEDoyoueverwishyouweremoreoptimistic,someonewhoalways【16】ex______tobesuccessful?Havings
Amanis48yearsold.Heaskstheothermanhowoldheis.Theothermananswers;"IamtwiceasoldasyouwerewhenIwasas
Gloria:______Daniel:Isaid,"Doyouwantmetohelpyou?"Gloria:Ifyou’resureyou’renotinahurry,youcangivemesome
随机试题
PowerPoint2003中,_______是使用最多的视图方式,它有两种模式,即大纲模式和幻灯片模式。
小儿,男,出生时体重为4kg,身长52cm。
患者,自觉胃脘灼痛,喜冷恶热,泛酸嘈杂,口干苦,舌红苔黄,脉弦数,治宜
患者女,43岁。心悸、气短。图3—2为按压颈动脉窦时心电图的变化,最可能的诊断为
施工单位安全生产管理三类人员是指()。
工业金属管道依照()分为GC1、GC2、GC3三个等级。
社会主义法治理念的基本内涵包括()。
TelevisionpitchmenforproductslikePajamaJeansandlightedslippersoncetriedtogetviewerstoplacetheirordersbyphone
利用“显示属性”对话框,将桌面设置为“显示大图标”。
Toacomparativeeducationalistmanyquestionsabouttheselectionandtrainingofdoctorsandlawyersindifferentcountries
最新回复
(
0
)