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Sudeep and Karthideyan were roommates. Sudeepwasboilingwater in avessel forbathing purpose. KarthikeyansaidSudeep , you knowwhenyou touchthe middlepartofthe vesselcontainingwater you can feellessheat thanwhat youcan feelat the top. Sudeepwasshockedto hear.Karthikeyantook athermometerand keptit at the topsurfaceof water. The temepaturewas rising.Againheinsertedit deep into the vesselcontainingwater , now thetemperaturehas fallen downthan in the previouscondition.Whatis tehtruthbehind it ? (i) It is good to keepourhanddeep intothe vesselto checkthiswhilethe liquid is boiling ? , (ii)Whatare convectioncurrent ? |
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Answer» Solution :The truthbehindthismagicis convectionprocess. It is a phenomenonof heattransfer in a fluid withthe actual movementof the particlesof the flud .i.e.,WHENA fluidis heatedthe hotpartexpandsandbecomeslessdense , so itrisesup andreplacesthe colderpartof fluid. Againthis fluidis heatedrisesup of replacesthe colderpartof thefluid. Thisprocessgoeson . THATIS whywhenweboilwaterheatwillbe from TOP layer of the liquid to thebottomlayer. (i)No,it is notgoodtochecklike this.Asthe toplayerof fluid is not,ourhandsmustcrossthislayerfirstto moveitdeepintothe veseelcontainingwatter.so youmaygetburnsorswells. (II) Convectioncurrentsare the constantcyclicalmotionof airwaterandothersubstanceto distributeheat . Asheatedairrises,forexampleit pullscoolerair intoitsplacewhereit can be heatedriseandpull in mostcoll air.Somegeologistsbelieveconvectioncurrentswithinthe Earth'smoltenrocks (insemi-liquid STATE)are a contributingcause ofvolcanoeseqrthquakes andcontinentaldrift. |
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