The sublimation pressure is calculated from the IAPWS-08 (IAPWS 2008) sublimation pressure equation [p.
08]) is calculated for given pressure p by solving iteratively the sublimation pressure equation (Equation 8) in terms of [T.
15 K and of the sublimation pressure of water from IAPWS-08 (IAPWS 2008; Wagner et al.
08] (T) is the sublimation pressure from Equation 8 of IAPWS-08 (IAPWS 2008).
Whatever is freeing the dust -- be it mere sublimation of the ice that traps it, electrostatic "levitation," or sudden bursts produced by the exposure of ices whose sublimation pressure
is lower than that of water ice -- the expansion of the area covered by dust provides a conspicuous signature.