Dear Authors,

The responses to the referee comments were excellent. At this point I only have few editorial comments. Therefore I accept your work with technical corrections.

Technical comments:

Footnote 3. Please use other than Wikipedia for the reference to the eutectic temperature.

Section 4.1. Please add a paragraph change: Secondly, we determined...

Move the sentence describing Figure 4 to the beginning of the paragraph starting with "The efflorescence radius, ".

page 25, line 15, Please start a paragraph at "Upon dehumidification..."

Section 4.2. Please add a reference to Figure 9 already to the beginning of the paragraph.

Section 4.2.3 Please remove comma before the word that in line 18.

Section 5, point 3: Please also mention that the results deviate from Russell and Ming (2002).

Page 31, line 10-11: The object under study is phase transitions in nanoparticles. They are suspended in environmental conditions that can be considered macroscopic. But without the detailed measurements of the nanoparticle size (microscopic) at different conditions, one cannot determine the interface parameters. I suggest refrasing.
Section 6.
Please add few paragraph breaks for easier reading; page 33, line 15; line 23; line 34; page 34, line 13;
page 34, in section 2. Thermophysical properties: … the calculus via the activation energy …

Figure 1: Please add a reference to Biskos et al. to the figure caption.

Figure 6: Please remote text "Ostwald-Freundlich equilibrium" and move it to the figure caption.

Figure 7 & 9: Distinguish the two heterogeneous nucleation pathways in Figure legend.
Figure 10: Please clarify legend. Figures are left and right.
Figure 11: & 12 Add sigma_inf corresponding to two curves in figure legend.