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.
Shape
It describes something that exists in material or physical form, or not an abstract subject
Water existing in gaseous form makes up the water found int the atmosphere and this is called Water-vapor.
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.
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.