ऊर्ध्वपातन
(aangrezi:Sublimation) kuchh padarth garm karane par sidhe thos roop se gais ban jate haian, ise oordhvapatan kahate haian. jaise- ayodin, kapoor adi. samanyatah thos padarthoan ko garm karane par ve drav avastha mean parivartit hota haian aur usake pashchath gaisiy avastha mean, lekin kuchh thos padarth aise hote haian; jinhean garm kiye jane par ve drav avastha mean ane ke badale sidhe vashn mean parinat ho jate haian aur vashn ko thanda kiye jane par punah thos avastha mean ho jate haian.
- garm karane par
thos padarth ←→ vashn
- thanda karane par
aise padarthoan ko oordhvapatan kaha jata hai v is prakar ki kriya oordhvapatan kahalati hai. rasayan vijnan mean oordhvapatan vidhi dvara do aise thosoan ke mishran ko alag karate haian, jisamean ek thos oordhvapatit ho, doosara nahian. aise thosoan ke mishran ko garm karane par oordhvapatan thos sidhe vashn avastha mean parivartit ho jata hai. is vashn ko alag thanda kar liya jata hai. is prakar donoan thos prithakh ho jate haian. is vidhi ke dvara kapoor, nephthalin, amoniyam kaloraid, eanthrasin, beanzoik aml adi padarth shuddh kiye jate haian.
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