### Lesson Objectives – the students should be able to:

- Convert from joules to calories and kilocalories and vice versa.
- Distinguish between the concepts of temperature and heat.
- Explain what is meant by specific heat, latent heat of fusion, and latent heat of vaporization.
- Apply the law of conservation of energy to problems involving calorimetry.
- Distinguish the three ways that heat transfer occurs: conduction, convection, and radiation.
- Solve problems involving the rate of heat transfer by convection and radiation.

### Lecture on Heat PPT

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### Summary of Chapter 14

- Internal energy U refers to the total energy of all molecules in an object. For an ideal monatomic gas,
- Heat is the transfer of energy from one object to another due to a temperature difference. Heat can be measured in joules or in calories.
- Specific heat of a substance is the energy required to change the temperature of a fixed amount of matter by 1° C.
- In an isolated system, heat gained by one part of the system must be lost by another.
- Calorimetry measures heat exchange quantitatively.
- Phase changes require energy even though the temperature does not change.
- Heat of fusion: amount of energy required to melt 1 kg of material.
- Heat of vaporization: amount of energy required to change 1 kg of material from liquid to vapor.
- Heat transfer takes place by conduction, convection, and radiation.
- In conduction, energy is transferred through the collisions of molecules in the substance.
- In convection, bulk quantities of the substance flow to areas of different temperature.
- Radiation is the transfer of energy by electromagnetic waves.

### Units of Chapter 14 – Keywords

- Heat As Energy Transfer
- Internal Energy
- Specific Heat
- Calorimetry – Solving Problems
- Latent Heat
- Heat Transfer: Conduction
- Heat Transfer: Convection
- Heat Transfer: Radiation

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*credit: Giancoli Physics*

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