Atmospheric pressure, energy level, polymorphs, isotopes, and alot of other factors.
matter
State
Matter
Water exists in liquid, (water); solid, (ice); and gaseous (steam) form.
It describes something that exists in material or physical form, or not an abstract subject
Shape
Case form factor determines the physical size of a power supply and the placement of a screw holes. It can be ATX, microATX, BTX and others.
Water existing in gaseous form makes up the water found int the atmosphere and this is called Water-vapor.
well, if it exists in your mind, it exists somewhere doesn't it!
Physical Control
water forming water vapor is physical change
The physical state that cannot exist in a solution is solid. This can be either liquid or gaseous states but not in solid form.