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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.