1. Energy Flows From Warmer To Cooler Objects
EQ: How is heat different than temperature?

2. Heat and Temperature
Heat – the flow of energy from an object at a higher temperature to an object at a lower temperature
Heat always flows from the warmer object to the cooler object
EQ: How is heat different than temperature?

3. Heat and Temperature
Temperature – a measurement of the average kinetic energy of particles in an object
EQ: How is heat different than temperature?

4. Thermal Energy
The total random kinetic energy of particles in an object
Different from temperature in that temp is an average and thermal energy is a total
EQ: How is heat different than temperature?
hot liquid
cold liquid

5. Thermal Energy Put ice in lemonade
Energy from warmer lemonade transfers to colder ice cube
Lemonade’s thermal energy decreases and the ice’s thermal energy increases
Particles in lemonade have transferred some of their energy to the ice particles
EQ: How is heat different than temperature?

6. Thermal Energy
EQ: How is heat different than temperature?
ice
heat
Particles in lemonade have transferred some of their energy to the ice particles
Therefore the average kinetic energy of the lemonade decreases and the temperature of the lemonade decreases

7. Measuring Heat
EQ: How is heat different than temperature?
Calorie – the amount of energy needed to raise the temperature of one gram of water by 1° C
Joule (J) – the international standard of measurement for measuring energy.
1 calorie = 4.18 joules

8. Specific Heat
The amount of energy required to raise the temperature of 1 gram of a substance by 1°C
Every substance has its own heat value
Each substance absorbs a different amount of energy in order to show the same increase in temperature
EQ: How is heat different than temperature?

9. Class Work and Home Work
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What did I Learn
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EQ: How is heat different than temperature?
Read selection 2-2 Energy Flows from warmer to cooler objects
Questions 1-6, p. B 48, “How Hot Is Hot” 1-3, plus the challenge question