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Chapter 2-2 Science
7th Grade Earth Science Heat Transfer
Term | Definition |
---|---|
Temperature | A measure of how hot or cold an object is compared to a reference point. (Review p. 43) |
Thermal Energy | The total energy of motion in the particles (molecules) of a substance. (p. 43) |
Thermometer | An instrument used to measure temperature (p. 43). |
Heat | The transfer of thermal energy from one object to another because of a difference in temperature. (p. 44) |
Conduction | The direct transfer of thermal energy from one substance to another that it is touching. (p. 44) |
Convection | The transfer of thermal energy by the movement of a fluid (p. 44). |
Convection Currents | The circulation of a fluid as it alternately heats up and cools down (p. 44). |
Molecules | Gases are made of small particles, called ______________ that are constantly moving. |
Faster/Slower | ____________ molecules have more energy, while ____________ molecules have less energy. |
2. Temperature | 2. ____________________ the average amount of energy of motion of each molecule of a substance. |
1. Radiation 2. Conduction 3. Convection | Three ways heat is transferred |
Troposphere | All three types of heat transfer work together to heat the ____________________________. |
Radiation | You cannot see it, but you can feel it as heat. |
1.5 Conduction | 1.5 The direct transfer of heat from one substance to another that is touching. |
2. Conduction | 2. Walking barefoot on hot sand |
Convection | The cat is sitting on top of the fireplace and the heat is rising to warm the cat. |
Example of radiation | Sun shining down on a glass of water |
Example of Convection current | A puddle on the street during the day heats up, then as the sun goes down the puddle cools. |