Interpretation: The classification of a substance as solid, liquid, or gas needs to be explained.
Concept Introduction: There are generally three

Explanation of Solution
Any matter can be changed from its state to another state by physical methods. For example, ice is solid but on mild heating, it can be converted into liquid (water). Thus, a change in state from solid to liquid takes place. On further heating liquid (water) state can change to a gaseous state (vapor). In all three states, the composition of water remains the same that is
All substances must have a natural state. This is the state in which they are present naturally or at room temperature. Here, heating and cooling change the state of matter, but the natural state of any matter is considered its actual state. For example, the natural state of water is liquid because it is liquid at room temperature. The state of any matter depends on its melting and boiling point. Substances with a very low melting point, generally have liquid states. On the other hand, substances with a very low boiling point, generally have a gaseous state. The natural state of the substance is its state when the temperature is between its melting and boiling point.
Chapter 2 Solutions
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