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31 8 q :d E^11 6H =J rB Aql^]+El ts44f Bql EBsiqE +t6lzl 9*l cz1z1 r+ts+ 49 grlal H4. cqlr'l *tzl zHrl9E 3tq) E+ gg qlEql cos+ ?ol Sszl tf,all 4 + npe+ ?ol +r9 Tl6J+e"l +Elur+. Bql 9lq^] *l= 9ea1g ril++g Bpel tr++^-l tszi€tr}. ol4 ,J"l vJ€*rgs. olalzlzl .-4tol ts4q= €^Jg + B 4(super cooling, under cooling) olzl aJ4. cutl 94 ,J+ ul 99 B^J++. olag gq49(embryo)rJ-7 ++. e8g ol+= +zlal€ *zlt)A 4zlEz} E +q al.'lz} 9Erll olag aaa.,ltzf gtr4g E q}{ol lrl. + gtr4g= sE qlLlzle+ nl4 qlLlzl. zlz)t 9l-L q]4ol zE s EqlLJZl. il4qlulzlql Hl6Iq +^l* + 9lzlt, H}4ol 4I9E s.EqlHzlE +^l 'J += StrI. + q€ HlaH+E = ulql= +iI +ql "Je6].al €zllts + 9lr}. ol +alg Hla E 'J AlEla (critical radius)olell +4. ul+^.1 g tr4 -?9 t]4 ol r.!-4 E qlql= 4 A"-qol EJ + 9ls+ r.!-4 49 qlql= rE6Iq flqA+. 3.*+++Cl .Je€ "lol g^Jg + 9l= raol AiqzlE +q Lllql^-l "-l^Jc"l +e 6IAl 'J 4 4eE- ol = +e "-4 C C (t omogeneous nucleation) ol el +4. f++E -&"-q +ql^] +eq CCol 'Jq+E r^Jr+ 'ltq tg^i4Be] z}+ql H zlE ,J? 4 ol4. rfl+ -&al Lllql EfEoJzlzI fzllalzl+ E. i{Hol 9l= *ol^l eA"-49 ol =+ d.J *ql ^ -l +El +d49E- ^JCqq ol . E+e"-q CC(heterogeneous nucleation) ol zl +4. ol 4+ e C " -q g 'l ^JgEql^l *al9 zl 9*g += 'J zi9 gE ql d+:'Iq c^Jq. TiolqE alEclHzl9 ts^J=*g +.J"1 ^Jcrl _ Hq ed 4tr}. 4+^] "-4CCql ggoJ +BE= uN$ $o|,r'l Rr+ +"cql zl4zl 9+=4. 4.44"lAlzl Bz] +4q. ol+. e€"Jal zlzlltl + + aag gzlulE4 99 ee el flzlull 99 € e6I. +Eol u _E flzlufl $ o1 e^'la €6};(l *6I.4 +t4 e -E e++ tr4E qq 9lq.4elrl ea'Jal= aacg ^Jd+ Hlcatlrllelr B + glg4 ol +Eg dol6(transition layer)ol4-lS. +4.