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Fum din cuburi de gheata, Cum?

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vali79m
post 5 Mar 2006, 22:28
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as vrea sa stiu cum se prepara gheta(cum se obtine), aceea care se pune in pahare, diferite boluri si scoate un efect de fum la suprafata apei.
Multumesc pentru raspunsuri


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sorin
post 5 Mar 2006, 22:46
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Pai........nu se poate cu gheata smile.gif Se foloseste DRY ICE care nu se topeste,se evapora. smile.gif
Deci trece direct din stare solida in stare gazoasa smile.gif


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vali79m
post 6 Mar 2006, 07:46
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bine..bine...si ce iti trebuie sa faci asta?, si de unde se cumpara?


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sorin
post 6 Mar 2006, 10:31
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Nu cunosc procesul,stiu ca este un produs destul de periculos,cauzeaza arsuri grave daca nu stii cum sa-l manuiesti.


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st0rm3ru
post 6 Mar 2006, 12:48
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tin minte ca am vazut acum cativa ani pe camp un efect similar. zapada se evapora direct fara sa se topeasca... gheata pe care o stim cu totii cred ca e mai greu sa se evapore direct, daca nu imposibil.


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florindu
post 6 Mar 2006, 12:50
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Se numeste sublimare capacitatea unui solid de a trece direct in stare gazoasa. Asa se explica uscarea rufelor intinse la uscat, afara, pe ger.


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st0rm3ru
post 6 Mar 2006, 14:32
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blorin: nu stiu cum se usuca ale tale, dar eu daca le scot afara in ger ude ingheata cu totul... laugh.gif


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florindu
post 6 Mar 2006, 14:37
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Daca ai rabdare si le lasi afara (daca au si altii rabdare sa le lase la locul lor) vei vedea ca in cateva zile de ger se usuca. Daca nu crezi, intreab-o pe mama/bunica ta. Vei avea surpriza sa afli ca se usuca.


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sorin1967
post 6 Mar 2006, 15:27
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Amesteca alcool cu glicerina si ai sa fi intr-o mare ceata wink.gif
Vantul usuca....


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sandman_
post 6 Mar 2006, 16:51
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rufele mai intai ingheatza si apoi se usuca. Daca s-ar usca direct, ar fi simpla evaporare.
Vantul are aceeasi contributie pe care o are si cand sunt 50 afara: scade cantitatea de vapori de apa din aerul din jurul rufelor.
Procesul de sublimare e mult mai lent decat cel de vaporizare.
Un exemplu clasic si des intalnit de sublimare este sublimarea naftalinei.


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florindu
post 6 Mar 2006, 18:14
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Parca am facut scoala impreuna!
Credeam ca nu-si mai aduce nimeni aminte de sublimarea naftalinei...


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vali79m
post 6 Mar 2006, 21:07
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pana la urma......cum se obtine acel efect de fum din gheata.


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valiusbug
post 6 Mar 2006, 22:28
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cu DRY ICE asa cum a zis mai sus si sorin. e vorba de dioxid de carbon inghetat (cu o temperatura de ~ -78.5 ?C)- care prin topire produce o ceata groasa asemanatoare cu fumul. nu stiu unde poti gasi de cumparat asa ceva in RO, pe afara am inteles ca e folosit (si) la pastrarea alimentelor.


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Tudor
post 6 Mar 2006, 23:09
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Ceea ce cauti tu este gheata carbonica. Firma de la care ai putea lua asa ceva in Buc se cheama ceva de genul GoldenIdeea. Am sa incerc sa-ti aflu maine ceva coordonate.


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3xtreme
post 9 Mar 2006, 14:11
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Cei de la Linde mai au ceva ce se numeste Ice Pellets, dar se foloseste industrial, pentru curatat monumente, pentru ca nu lasa praf ca nisipul folosit la sablare...


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richie
post 9 Mar 2006, 16:03
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Nu-s un mare fan al chimiei sau al acestei parti a fizicii, dar cred ca, fenomenul se poate obtine prin inghetarea unui "corp" care are ca stare naturala, starea gazoasa si care nu trece prin faza de lichid in drumul lui spre starea naturala. Probabil cel mai usor e cu dioxidul de carbon. Sau cel mai ieftin


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sandman_
post 9 Mar 2006, 16:58
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acesta e procesul de desublimare wink.gif


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richie
post 9 Mar 2006, 16:59
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Aha.....tot e bine....am intuit ceva =))=))


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vali79m
post 12 Jul 2008, 12:24
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Desi cand imi trebuia nu am gasit...acum cand nu imi trebuie va pot spune de unde se poate cumpara aceasta gheata uscata(dry ice), si anume de la BUSE, ii puteti gasi pe Drum intre tarlale(Sat Catelu-parca) la intrare pe autostrada Soarelui.


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