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Vreli led - Festival fizike 30. 4. 2009.

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Uploaded by on May 12, 2009

Pri prelasku iz čvrstog u tečno stanje supstanca mora da primi odredjenu količinu toplote a pritom ne menja svoju temperaturu, ta količina energije po jedinici mase te supstancije se nayiva latentna toplota. Ovde se natrijum acetat- vrući led topi na 56 C. Kasnije se hladi ali ne prelazi u čvrsto čak i na sobnoj temperaturi. Sve dok se ne ubaci klica kristalizacije. Ona je "model" po kome se obrazuju dalje kristali. Kada n.a. predje iz tečnog u čvrsto on otpušta latentnu toplotu pa se zbog tog efekta zove vrući led. Ova pojava se koristi kod grejača za ruke u zimskom periodu.

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