Wiktionary
solid phase
n. (context physics English) One of the three fundamental structural phases of matter in which the cohesive force of matter is strong enough to keep the molecules or atoms in the given positions, restraining the thermal mobility.
Usage examples of "solid phase".
It turns out that the solid phase of helium does not exist at atmospheric pressure, or at any pressure less than 25 atmospheres.
Where she sat, mist curled up and snowed immediately down again as the methane sublimated and almost instantly recrystallized to solid phase in the bitter cold.
Thanks to the Gulf Stream, the temperature had risen into the high thirties, so precipitation was in the liquid rather than solid phase.