Conversation so far:
what are some different ways that you can make a physical change to a piece of string
what are some different ways that you can make a physical change to water
Some examples of physical changes in water include boiling it and freezing it
what constitutes a physical change
A physical change is a type of change in which the form of matter is altered but one substance is not transformed into another.
can changes be reversible in a physical change
In general a physical change is reversible using physical means

Question: what is an example of the change
Self-contained rewrite: what is an example of a reversible change in physical change