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Chapter 2-2 Science

7th Grade Earth Science Heat Transfer

TermDefinition
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.
Created by: dsimmons
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