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
2023-10-19
23
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] ______ People have good reasons to feel cool on a hot dry day because of quick evaporation.
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/3111446.html
相关试题推荐
Thestoresellsliquidvitamins________designedforchildrenunder3.A、explicitl
Whetherwe’llholdthesportsmeetingdependsontheweather,______?A、won’twe
It’snotliquid,gasorsolid.It’snotananimal,aplantoramineral.It’stran
Heatlossbysweatingdependsonthefactthatwhenaliquidevaporates,it
Heatlossbysweatingdependsonthefactthatwhenaliquidevaporates,it
Heatlossbysweatingdependsonthefactthatwhenaliquidevaporates,it
Sincewearesocialbeings,thequalityofourlivesdependsinlargemeasur
Sincewearesocialbeings,thequalityofourlivesdependsinlargemeasur
It’snotliquid,gasorsolid.It’snotananimal,aplantoramineral.It’s
一名大学生能否成功取决于他努力的程度。(名词性从句)Whetheracollegestudentcansucceeddependsonhowh
随机试题
RegistrationofforeignnationalsatthehealthcentrestandardproceduresRegis
Accordingtoexperts,companionshipandsocialsupportarevitaltobothourpsy
Wehavelostconsiderablebusinessonaccountofyourdelayindispatching.A、由于你
德育过程是在一系列矛盾中展开的,是一系列矛盾运动和变化的过程。这一系列矛盾主要包
在泗洪双沟镇东下草湾发现的人类化石,古人类学界称之为“下草湾人”,属于旧石器时代
下列哪一个生产或实验过程,不能使用吲哚乙酸( )A.处理扦插的月季枝条,促使
关于我国产业结构调整的说法,不正确的是()。A:2005年国务院发布的《促进产
医疗保险是当人们生病或受到伤害后,由国家或社会给予的一种物质帮助,即提供医疗服务
人们在知觉外部事物的时候,会把一部分物体当作对象,其他部分当作背景,这表明知觉具
根据《计价规范》的规定,下列计日工生效原则的描述中,正确的是()。A.发包人通
最新回复
(
0
)