首页
登录
职称英语
Heat loss by sweating depends on the fact that when a liquid evaporates, it
Heat loss by sweating depends on the fact that when a liquid evaporates, it
游客
2024-08-19
4
管理
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. [br] ______ According to the passage, it can be inferred that housewives prefer to hang their washing on 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://tihaiku.com/zcyy/3726015.html
相关试题推荐
Heatlossbysweatingdependsonthefactthatwhenaliquidevaporates,it
Heatlossbysweatingdependsonthefactthatwhenaliquidevaporates,it
Heatlossbysweatingdependsonthefactthatwhenaliquidevaporates,it
Heatlossbysweatingdependsonthefactthatwhenaliquidevaporates,it
Sincewearesocialbeings,thequalityofourlivesdependsinlargemeasur
Sincewearesocialbeings,thequalityofourlivesdependsinlargemeasur
—Whoareyourmaincompetitors?—Itdependsontheregion.Therearealotoflo
It’snotliquid,gasorsolid.It’snotananimal,aplantoramineral.It’s
It’snotliquid,gasorsolid.It’snotananimal,aplantoramineral.It’s
Diamondshavelittle______valueandtheirpricedependsalmostentirelyonthei
随机试题
Aperson’shomeisasmuchareflectionofhispersonalityastheclotheshe
Easteriscelebratedeveryspring.IiisalwayscelebratedonaSunday.Eas
QuestionnaireDesignI.Clarifyyourstudygoal—Writedownyourstudygoalbef
信用评分模型是分析借款人信用风险的主要方法之一.下列各模型不属于信用评分模型的是
在公司信贷产品组合策略中的特殊产品专业型策略的特点是( )。A.产品组合的宽度
除合伙企业另有约定外,合伙企业的下列事项应当经全体合伙人一致同 意才可通过的有
最早提出“什么知识最有价值”这一经典课程论命题的学者是()。 A.夸美纽斯
A.μ<0.5 B.0.5<μ<0.7 C.0.7<μ<2 D.μ>2
卫星电视接收系统中,将卫星天线收到的微弱信号进行低噪声放大、变频的设备为()。
无痛性黄疸伴胆囊增大最可能是A.十二指肠乳头炎 B.胆道蛔虫病 C.壶腹周围
最新回复
(
0
)