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
82
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.
______ Hot windy days are much more comfortable than hot still days.
选项
A、T
B、F
C、NG
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/i1VK777K
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
Threehundredyearsagonewstravelledbywordofmouthorletter,andcirculatedintavernsandcoffeehousesintheformofpa
Whatdeterminesthekindofpersonyouare?Whatfactorsmakeyoumoreorless【C1】________,intelligent,orabletoreadamap?
Becauseofhispoorhealth,ittookhimalongtimetothrow________hisbadcold.
Wedonotusuallygivemuchthoughttohowthethingsthatsurroundusinoureverydaylivesarecreated.Everythingweuse—from
LOOKONTHEBRIGHTSIDEDoyoueverwishyouweremoreoptimistic,someonewhoalways【16】ex______tobesuccessful?Havings
Conventionalwisdomsaystreesaregoodfortheenvironment.Theyabsorbcarbondioxide—agreenhousegas—fromtheatmosphereand
Whataretheytalkingabout?
Amanis48yearsold.Heaskstheothermanhowoldheis.Theothermananswers:"IamtwiceasoldasyouwerewhenIwasas
ThespeakersaretalkingaboutNorwoodUniversityonthephone.
IfGIBE-FADE=81,thenDICE-CEDE=?
随机试题
麦角新碱用于治疗产后子宫出血的理由是
溃疡性结肠炎腹痛特点是
决定拆迁安置的地点是()。
背景资料某立井井筒井深815m,净直径7.5m,井筒基岩段井壁厚度600mm,混凝土强度等级C40。一施工单位承担了该井筒的施工,所采用的砌壁模板为金属整体液压下移式伸缩模板,高度4.0m,且可拆解均分为两段。施工中,受断层和岩层倾角变化的影响,井筒提
下列计算会计科目期末余额的公式中,正确的有()。
下列产品不计入国内生产总值的是()。
食物供给中既要考虑量的多少,又要考虑是否优质的营养成分为()。
坚持“二为”方向是()。
美国学者共跟踪调查了______名美国新生婴儿。通过以上资料我们可以看出,平均而言,婴儿血液中每升增加100毫克铅,其智商就会下降_______个点。
(1)Afterthirtyyearsofmarriedhappiness,hecouldstillremindhimselfthatVictoriawasendowedwitheverycharmexceptthe
最新回复
(
0
)