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
60
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
(1)Menandwomenapproachproblemswithsimilargoalsbutwithdifferentconsiderations.Whilemenandwomencansolveproblems
(1)Theirdefenderssaytheyaremotivated,versatileworkerswhoarejustwhatcompaniesneedinthesedifficulttimes.Toother
WhenBarackObamafirstranforpresident,EmmaHamiltonwaspartoftheworkingclass.Ms.Hamiltonworkedasaloaderatafac
Weallseeandhearaboutextraordinarypeoplearoundusandwonderwhywecan’tbemorelikethem.Sometimeswechuckthatnoti
TherearemanytheoriesaboutthebeginningofdramainancientGreece.Theonemostwidelyacceptedtodayisbasedontheassum
(1)LittleBinhandPhuocWagnerhoppedontoaschoolvanrecentlyontheirwaytokindergartenclassforthefirsttime.Their
Though________rich,shewasbetteroffthanatanyotherperiodinherlife.
A、Hewasmuchluckierthanothers.B、Hewasbetteratcharityworkthanothers.C、Hegaveawayallhismoneytothepoor.D、Hec
Conventionalwisdomsaystreesaregoodfortheenvironment.Theyabsorbcarbondioxide—agreenhousegas—fromtheatmosphereand
Wenowhavephotography,film,radio,TV,thetelephone,mobilephoneandmanyelectronicdevices.Somepeoplesayreadingandw
随机试题
如图标志的含义是什么?
《中国药典》2000年版共收载药品总数
一般来说,工程咨询公司的组织形式主要由()来决定。
记账凭证按与货币收付业务是否有关,可以分别编制的凭证是()。
下列资金中,不属于政府采购资金范围的是()。
我国证券分析师行业自律组织是()。
下列属于保险公司治理结构监管主要内容的有()。
—MayItakemylunchtothereadingroom?—No,you__________.Youshouldfinishitrighthere.
下列关于人民代表大会制度的说法,正确的是:
Whatwastheweatherlikeinthecountry?
最新回复
(
0
)