what is the difference between phase and states of matter
There is no difference between the phases and states of matter.
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• A phase is a region with uniform chemical and physical properties and is separated by distinguishable boundaries.
• States of matter are the forms in which different phases can exist. Solid, liquid and gas are the most common states of matter on earth.
• In one state of matter, many forms of phases can exist. For example consider the bottle with gasoline and water. Both are in a liquid state, but in different phases. The same concept can be applied to solids, though the gasses tend to violate this, but not explicitly.