What’s a state? Let’s use the example of the states of matter: solid. liquid, and gas (we’ll ignore plasma to keep this simple). There are well defined transitions to move between these states:
- melting transitions from solid to liquid,
- freezing transitions from liquid to solid,
- evaporating transitions from liquid to gas,
- condensing transitions from gas to liquid, and
- sublimating transitions from solid to gas.
Each of these have conditions in terms of material, temperature, and pressure that control whether or not the transition can happen. A simplified example of this is that when its temperature is less than 0C (32F), water will freeze transitioning it from a liquid state to a solid state.
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