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-----Original Message-----
From: Forum for Physics Educators
[mailto:PHYS-L@list1.ucc.nau.edu] On Behalf Of Ludwik Kowalski
Sent: Sunday, September 26, 2004 9:52 PM
To: PHYS-L@LISTS.NAU.EDU
Subject: Re: latent heat of evaporation
As far as i know no bubbles are formed when evaporation takes
place without boiling, for example at 90 C. Molecules escape
from a flat surface overcoming surface tension forces. That
is when, I suppose, the value of 540 cal/g is valid. This
topic is new to me. I do not know what to expect when bubbles
are formed. Should L become larger or should it become
smaller than 540? Perhaps someone will supply the answer
based on thermodynamics. Or on laboratory data. I am sure
that the topic has been studied in the past. Ludwik Kowalski