*7.8B Understanding Thermal Equilibrium

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What is thermal equilibrium?

Back

Thermal equilibrium is the state in which two substances reach the same temperature and no more heat is exchanged between them.

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How does thermal energy flow between objects of different temperatures?

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Thermal energy flows from the warmer object to the cooler object.

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What happens to the temperature of a metal spoon placed in hot coffee over time?

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The spoon will become warmer until it reaches the same temperature as the coffee.

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What occurs when an ice cube melts in warm water?

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The ice cube and the warm water reach the same temperature, demonstrating thermal equilibrium.

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What is the result of placing a hot object in contact with a cooler object?

Back

Thermal energy moves from the hot object to the cooler object.

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What is an example of thermal equilibrium in everyday life?

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An ice cube melting in a glass of warm water until both reach the same temperature.

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What does it mean when two substances continue to exchange heat?

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It means they have not yet reached thermal equilibrium.

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NGSS.MS-PS3-5

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What happens to thermal energy when two objects at different temperatures are in contact?

Back

Thermal energy moves from the hotter object to the cooler object.

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Can thermal energy flow from a cooler object to a warmer object?

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No, thermal energy flows from the warmer object to the cooler object.

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What is the significance of reaching thermal equilibrium?

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It indicates that the temperatures of the substances are equal and no net heat transfer occurs.

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NGSS.MS-PS3-5