Phase changes

[105561735]

Are there any phase changes that are reversible and if so what affects reversibility?

[205538966]

A physical change such as a phase change can be reversible or irreversible depending on the conditions under which it occurs. For example, if water vapor (gas) is cooled, it can condense back to liquid water, which is a reversible change.

[Isabelle Huerta 2I]

Yes, there are times where a phase change is reversible. We have to take into account the rate that it cools/heats because it can play a role in its ability to be reversible. Cooling/heating at a slower rate than most will take the phase change longer to reach equilibrium so there is more mobility to reverse this change. Another thing that affects reversibility is whether the substance is a pure substance or not. Pure substances are more likely to be reversible in phase changes than an impure substance.