J	nucleation rate
A	a kinetic constant that includes the attachment frequency of monomer molecules
N 0	the concentration of potential nucleation sites
Δg	the height of the activation barrier
k	the Boltzmann constant
T	the absolute temperature
g(r)bulk	the free energy of forming a new phase at a constant temperature in the absence of an interface
g(r)interfacial	the interfacial free energy between the new phase and the old phase at a constant temperature
Δg(r)activation	the height of the activation barrier at a constant temperature, which is the sum of g(r)bulk and g(r)interfacial
r	the radius of the nucleus
P	the actual vapor pressure
P 0	the saturation vapor pressure
γ	the specific interfacial free energy
v m	the molecular volume
r K	the Kelvin radius. For a spherical nucleus, r = 2rK
n	number of molecules in a nucleus
n*	number of molecules in a critically sized nucleus
θ	the contact angle of a spherical cap–shaped nucleus that forms on the substrate in the metastable parent phase
W(n)	nucleation work, which is a function of the size of the nucleus