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Thermal Energy Transfer
“How Heat Moves”
What is Thermal Energy?Thermal energy (we often call this HEAT) is:
The amount of movement of the particles that make up a substance.
You probably remember this from earlier in the year.
The particles in a solid: VIBRATE
The particles in a liquid: SLIDE
The particles in a gas: ZOOM!
How Heat Moves
Thermal energy can move from one place to another in three ways:
• Conduction
• Convection
• Radiation
Thermal Energy will ALWAYS move from ________________ to _______________HOT COLD
Thermal Energy will STOP moving when it reaches ______________________. EQUILIBRIUM
CONDUCTIONConduction is: The transfer of heat by direct contact. No matter moves.
In our “possum” model, conduction is shown: When the stuffed animal moves from person to person to person.
HEAT ENERGY.
MOLECULES.
The stuffed animal represents:
The people passing it represent:
Draw it!
CONVECTIONConvection is:
The transfer of heat by currents within a fluid. Matter moves.
In our “possum” model, convection is shown: When the stuffed animal is carried by one person from one side to another.
HEAT ENERGY.
ONE MOLECULE,TRAVELING.
The stuffed animal represents:
The person carrying it represents:
Draw it!
Remember: liquids or gases
RADIATIONRadiation is: The transfer of thermal energy by electromagnetic waves. No matter is needed!
In our “possum” model, radiation is shown: When the stuffed animal is thrown across the room.
HEAT ENERGY.
NONE!!!
The stuffed animal represents:
The people passing it represent:
Draw it!
• Conduction is in solids.
• Convection is in fluids (liquids and gases)
• Radiation is through anything that will allow it to pass.
Insulators
• A material that blocks or reduces the flow of heat, electricity, or sound.
Brainstorm some ideas of materials that are GOOD insulators:
Conductors
• A material that transfers heat or electricity.
Brainstorm some ideas of materials that are GOOD conductors:
