De Ce e Mai Frig Cînd Bate Vîntul
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25.06.2015 Deceemaifrigcndbatevntul?ScienceFriction
http://www.sciencefriction.ro/2012/02/09/emaifrigcindbatevintul/ 1/9
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coaladeeducaieifizicCercetaridintoatezrile,uimiim!CerulviciosMapamondulnuntreabNonscienceFrictionAbout
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Feb09
Deceemaifrigcndbatevntul?Categories:
Mapamondulnuntreab...
byTataUraniu
Poatecnautobuzul331(sauoricarealtul),nghesuiiprecumsardinelenconservesaucapinguiniipebanchiz,antiiaduldeafarnuvisepareattdenfiortorderecepectestedeadevratelea.Poatecinjuraidezorpesusintoriipovetiicunclzireaglobal,cndrcirealocaladattotulpestecap(despreastamaivorbimcndofimaicldu).
Sau,poate,cndieiidinautobuzul331(sauoricarealtul),vlovetebruscaaungercnicinumaiaveiputereasvntrebaiDecenaibamieattdefrig?.Ei,delaclduric,eumamntrebatiamiaflatrspunsul.Aredeafacecufelulncarepercepemnoifrigulicldura.Corpulnostrureacioneazlatemperaturiexcesive(preamarisaupreamici)prinreglareaniveluluidetranspiraieiatemperaturiisuperficiale(unsistemfrigorificabsolut
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25.06.2015 Deceemaifrigcndbatevntul?ScienceFriction
http://www.sciencefriction.ro/2012/02/09/emaifrigcindbatevintul/ 2/9
genialcreatdectrenatur).Cndceledousntreglate,nfunciedetemperaturamediului,percepianoastrestefiecepreacald(vara,cndeumiditatemare)fieprearece(iarna,cndmaibateicrivul).Despreheatindexospovestimlavar,cndoficazul.Acumvorbimdewindchillfactor,saufactorulderciredinparteavntului.
Sigurtiidespreefectulvntului/curentuluiasupraevaporrii.Sautiifrstii.Deaiafolosimusctoaredepr,sauturbinelealeadeuscatminileprintoaletelebarurilor:cuctvitezaunuicurentdeaerpedeasuprauneisuprafeeemaimare,cuattevaporareaemairapid.ideaiavuscai,lamare,chiardacsoareleeascunsnnori,nsbatebriza.Totodat,organismulpierdecldurprinprocesulevaporriidepesuprafaapielii.ideaiaviatremuriciulcndvuscainbriz.
Eibine,cndefoartefrigcorpulncearcsipstrezetemperaturasuperficialsuficientderidicatnctsnuaparefectenasoaleasupraorganismului(degerturi,paregzamplu).Iarmeninereatemperaturiipieliimainaltdecttemperaturadinexterior,plusevaporareamairapiddincauzavntului(decipierdereamairapiddecldur)vcreeazsenzaiacemaifrigdectarindicaotemperaturadinexterior.
Aiciintervineaazisulwindchillfactor.Existioformuldeconversie,pecareamdescoperitopewikipedia:
TWC=13,12+0,6215xTa11,37xV0,16+0,3965xTaxV0,16,
undeTaestetemperaturaaerului,iarVestevitezavntuluila10metrinlime(acoloseplaseazanemometrele).Iaca,deexempludacafarsnt10oCiunvntdenuma50dekm/h,senzaiavoastrvaficsnt22oC.Camaspru,nu?
Pentrualtetemperaturiivitezealevntuluiputeiaflatemperaturaaparentdintabelulsta,csntsigurcnuvveiapucasfaceicalculecuecuaiademaisus.
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25.06.2015 Deceemaifrigcndbatevntul?ScienceFriction
http://www.sciencefriction.ro/2012/02/09/emaifrigcindbatevintul/ 3/9
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Peminemiacutremuricinumacndmuitlatabelulsta,darmitesmaiiiesnteroareadeafar!Voicumrezistai?
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Deceemaicaldcndumiditateaimare?(11)Kelvinderegiunesuperior(7)Cumosmipetrecsfritullumii.Azi,focul(II)(4)
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Tags:evaporare,frig,heatindex,piele,temperatura,vnt,windchillfactor
10comments
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1.
Mimanu
February9,2012at16:11(UTC3)
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25.06.2015 Deceemaifrigcndbatevntul?ScienceFriction
http://www.sciencefriction.ro/2012/02/09/emaifrigcindbatevintul/ 4/9
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Nutiseparecevaciudatinformulaasta?DacainlocuiestiTasiVcu0itidaunrezultatde13.12C.
1.
Mimanu
February9,2012at16:28(UTC3)
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Gasitexplicatia.Formulaseaplicapentruunintervaldetemperaturide(inf,10)(intervalinchisla10,daramtastaturainromanasinugasescparantezadreapta )sipentruunintervaldetemperaturide(4,8km/h,inf)
1.
TataUraniu
February9,2012at21:07(UTC3)
Acumamajunsiioacasitocmaimpregteamsirspundcuexactcezicitumaisus.
2.
Mimanu
February9,2012at16:23(UTC3)
Reply
Inlocsafactreabamatindeprostii.MiamadusamintecainapropierearevelionuluiamvazutostirecalaVf.Omusaresimtitotemperaturade88grade.Amfacutunexcelacumcuformuladatadetine,iarpentruovitezaavantuluide144km/h(conformarticolului)temperaturaaeruluiarfifostde50C.MisepareamiecusutacuataalbatreabaastaConcluziaestecaavemredactoridetoatajena.Aiciarticolulverificat:http://www.a1.ro/news/social/88clavarfulomurecorddetemperaturascazutadincauzavantului190056.html
1.
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25.06.2015 Deceemaifrigcndbatevntul?ScienceFriction
http://www.sciencefriction.ro/2012/02/09/emaifrigcindbatevintul/ 5/9
TataUraniu
February9,2012at21:11(UTC3)
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Defapt,conformtabeluluiasociat(stademaisus)88degradenegativnseamncam55ivntde80km/h.Vntularfiok,plauzibil,da55lambagndubii.Armaiputeafi35iovitezcolosal,pecaremielenesocalculez.
3.
belami
February9,2012at20:14(UTC3)
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ecuatiaaiaare,defapt,doardouarezultate:efrigdetecacipetinesaube)nu
1.
TataUraniu
February9,2012at21:12(UTC3)
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Efrigdetecacipetinesaube)eattdefrig,cnicistecacipetinenuetinstare.
1.
belami
February10,2012at14:48(UTC3)
tresamainclin!cinesepricepesepricepe!stiintanuipentruoricine
4.
Mostrofontz
February10,2012at19:46(UTC3)
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25.06.2015 Deceemaifrigcndbatevntul?ScienceFriction
http://www.sciencefriction.ro/2012/02/09/emaifrigcindbatevintul/ 6/9
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Da,mistorelatia!Melikeit!DaioprefersafiecaldRelatiaastaimiaduceamintedeNansensiexpeditiaFram,candneneaNansencuamicului(Johansenparca)aupetrecutmaibinede1anpecalotaglaciaranordica.Cumorfisupravietuit,eistiuUiteaiciunlinkpentrucinenaretreabazileleastea:http://vplay.ro/watch/nmmbyubd/EuimiamintesccumausarbatoritCraciunul:Nansensiaschimbatchilotiiprimaoaradupaunandezile(introexpeditiepolaraprobabilcaieipapicasicombustibilsatopestigheata,nuchiloti)iaramicullui,sielcredcatotnespalatdevreunansiaintorscamasapeparteaailaltaUau!Orelatiedechillfactorcandtebagisafacibaielacopcanai?Candsunt55degradeinaeruldinjur,cumteoisimticandtebagiinapa?!
1.
TataUraniu
February10,2012at23:26(UTC3)
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haha,iocrecapaeramaicald,nu?ceeaceenasol,cieiitetaiefrigu.Nicinuvreauscomentezpeaiacuchiloi/tricountors.Decipentrudinstea,namnicirelaii,nicicomentarii.Dectcnusemaifabricoamenidintia.
1. Deceemaicaldcndumiditateaimare?|ScienceFriction
July10,2012at09:02(UTC3)Linktothiscomment
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[]textmaivechi.Areaproapeaseani,dasituaiaefixaceeai.Pentrucvaranuicaiarna(duh!),darnicicavaratrecut.Emai[]
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