what allows water to change to all three states (liquid,gas,solid)
2 answers
Hmmm! I'm far from being a science teacher, but I often change water (a liquid) into a gas and a solid in my kitchen.
Pressure and/or temperature depending on where you are on the phase diagram.
There is an example of the water phase diagram here:
http://en.wikipedia.org/wiki/Phase_diagram
There is an example of the water phase diagram here:
http://en.wikipedia.org/wiki/Phase_diagram