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### 1102-B: Thermal Contact 1

• Topic Cluster: Thermodynamics
• Topic: Heat Transfer and Temperature: Mathematical
• Objective: Recognize (multiple choice) how heat will move when two objects are in thermal contact; determine when such a process ends.
• Content: Heat energy moves from an object with higher temperature to an object with lower temperature until the two objects have the same temperature.
• Level: 1

#### Thermal Equilibrium

Thermal Contact

When two objects are able to exchange heat, they are said to be in thermal contact. Typically, two objects in thermal contact are touching.

• When two objects in thermal contact have the same temperature, they are in thermal equilibrium.
• If a warmer object and a cooler object are in thermal contact, then heat moves from the warmer object to the cooler object until they are the same temperature (thermal equilibrium).

For each statement, state if it is true or false.

1. It is called thermal equilibrium when two objects in thermal contact have the same temperature.
2. Heat always moves from the warmer object to the cooler object.
3. Heat always moves from the cooler object to the warmer object.
4. Heat moves between two items until they have the same temperature.
5. Heat can stop moving while two items still have different temperatures.
1. When two objects are able to exchange heat with each other, this is called ________________.
2. Whenever two things have the same temperature, this is called _________________.

Fill in the blanks using items from the word bank below.

##### Word Bank:
• same
• iron
• decrease
• water
• thermal equilibrium
• increase
Billy the Blacksmith has been working very hard. He heats up a piece of iron and pounds it into the shape he wants. Then, to cool down the iron, he throws it into a cold bucket of water. When he does this, heat is going to move from the
1. _______________
2. to the
3. _______________
4. . The temperature of the water is going to
5. _______________
6. . The temperature of the iron is going to
7. _______________
8. . This process keeps going until they have the
9. _______________
10. temperature, which is called
11. _______________
12. .

#### What about States of Matter?

Heat always moves from an object with a higher temperature to an object with a lower temperature, regardless of whether the objects are solid, liquid, or gas.

1. The air outside is 10°C, You buy a hot dog that is 28°C. How does heat move, and why?:
1. From the air to the hot dog, because the air is a gas and the hot dog is a solid.
2. From the hot dog to the air, because the hot dog has a higher temperature.
3. Heat does not move in this situation.
2. A lobster is heated up to 40°C in a pot, but escapes and gets back into the ocean, which is only 15°C How does heat move, and why?
1. From the lobster’s shell to the water, because heat moves from a solid to a liquid.
2. From the water to the lobster’s shell, because heat moves from liquid to solid.
3. From the lobster’s shell to the water, because heat moves from a higher temperature to a lower temperature.
4. From the water to the lobster’s shell, because heat moves from a lower temperature to a higher temperature.
3. A football has been left outside. The air is very cold, at only 2°C. The football also has a temperature of 2°C. How does heat move and why?
1. Heat moves from the football to the air because heat moves from a solid to a liquid.
2. Heat moves from the air to the football because heat moves from a gas to a solid.
3. Heat does not move in this situation.

#### What does the word equilibrium mean?

The word equilibrium is used frequently in science and in many other academic fields as well. It refers to a state that is settled and not changing.

"Thermal equilibrium" is called an equilibrium because heat does not move.

#### BACK to Ladder Heat Transfer and Temperature: Mathematical

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