Substituting the values in equation (5.13b), the free energy change takes the form

(5.14)

Thus, this process is also favorable only when as in homogeneous nucleation.
From Fig. 57, we can write

(5.15)

So from equation (98), we get

(5.16a)

From Young’s equation, we know

(5.16b)

The above equation is valid for the values of such that . If is the molar volume of liquid and is volume of liquid condensed on surface then, .