The interconversion of states refers to the transition of a substance between its solid, liquid, and gas states through physical changes, where the substance remains chemically unchanged.
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Physical changes involve alterations in the state or appearance of a substance without changing its chemical composition, whereas chemical changes result in the formation of new substances with different chemical properties.
Water is a classic example of a substance that undergoes physical changes as it transitions between its solid (ice), liquid (water), and gas (water vapor) states.
Changes in state, such as melting or boiling, are considered physical changes because they occur without altering the chemical composition or nature of the substance.
Physical properties are observable characteristics of matter that can be specified, such as color, hardness, rigidity, fluidity, density, melting point, and boiling point.