Final answer:
A closed system does not exchange matter with its surroundings but can exchange energy. Among the options, a covered pan with water qualifies as a closed system since it retains its water while allowing some energy transfer. All other options listed involve exchanges with the environment, making them open systems.
Explanation:
Understanding Closed Systems
A closed system is defined as a physical system that does not exchange matter with its surroundings, but can exchange energy. In the context of the options given:
- Covered pan with water: This can be considered a closed system because steam may be produced and some heat may escape, but no water is lost if it is completely covered.
- Open cup of coffee: This is an open system since both heat and steam (matter) can escape into the environment.
- Ocean: While vast, the ocean is an open system as well; it exchanges both matter (like fish and pollutants) and energy (like heat from the sun).
- Glass of water: This is generally an open system because it can exchange heat and possibly some water molecules with the air if left open.
Therefore, the covered pan with water is the best example of a closed system among the options provided.
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