faradeyev pokus
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FARADEYEV POKUS. Pripemila:Ivana Pršlja, VII a OŠ “13.RUJAN” Jajce. CILJ: Dokazati da komad žice može proći kroz led- objasniti Faradayev pokus. Potreban pribor:. Potrebni pribor:. posuda. Boca sa vodom. voda. žica. POSTUPAK. - PowerPoint PPT PresentationTRANSCRIPT
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FARADEYEV POKUSPripemila:Ivana Pršlja, VII a
OŠ “13.RUJAN” Jajce
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CILJ:Dokazati da komad žice može proći kroz led- objasniti Faradayev pokus.
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Potreban pribor:
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Potrebni pribor:posuda
voda
žica
Boca sa vodom
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POSTUPAK
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Vodu uliti u posudu, te ju staviti u hladnjak i pričekati da se zamrzne.
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Nakon što se voda zamrzne, oko leda treba omotati žicu.
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Boca s vodom,koju smo objesili oko
leda,će stvarati veći tlak ispod žice, topiti
ga na nižoj temperaturi i tako će žica moći proći kroz
led ,a da ga ne prelomi.
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Na žicu staviti bocu sa vodom ili nekim utegom ( da povećamo tlak ispod žice).
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I tako pričekati kako bi žica prošla kroz led.
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Nakon 1h.
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Istovremeno dok žica prolazi led se otapa(taljenje) i ponovno zaleđuje(skrućivanje).Ta promjena se naziva
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REGELACIJA
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Nakon 2 h.
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Zaključak:
Objesimo li žicu s utegom o led (povećamo li tlak ispod žice, snizit ćemo temperaturu tališta).
Nakon nekog vremena žica će proći kroz led , a komad leda će ostati čitav( jer sa prestankom djelovanja većeg tlaka, ponovno se povisila temperatura tališta i voda iznad žice se zaledila) .
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Hvala na pozornosti!
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KRAJ