Energy Transfer

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Energy Transfer

• Conduction
• Convection
• Radiation

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Conduction

• Energy is conducted from molecule to molecule.
• For conduction to occur between 2 materials they
  MUST touch each other

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Conduction
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Conduction
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Conduction

• Hot gas molecules rising from the candle touch
  the metal and cause the metal molecules to
  vibrate.
• HEAT is vibrating molecules

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Conduction
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Conduction

• The vibrating metal molecules cause the molecules
  next to them to vibrate
• Thus, the heat spreads from where it is hot
  (vibrating) to where it is cooler.

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Conduction
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Conduction
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Convection

• Convection is when heat transfers by causing a
  MASS FLOW of matter.

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Convection

• Convection heat transfer only happens in liquids
  and gasses.

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• Energy causes liquid and gas molecules to bounce
  all around and push each other further apart.
• When the molecules are further apart they are
  less dense as a group, so they rise through the
  denser molecules around them, causing an upward
  flow

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Convection on a Beach

1. Air touches the hot sand and heats by CONDUCTION
2. The heated air expands and becomes less dense
3. The less dense air rises

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Radiation

• Radiation is waves of energy that travel through
  space.
• Energy that transfers by radiation does not
  travel through matter very far.

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Radiation

• Radiated energy is absorbed when it strikes
  molecules and makes them vibrate.
• Thus the radiated energy then becomes heat.
  (Molecular Motion)

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Radiation
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Radiation, Conduction Convection
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Convection

• As the air rises it gives off its heat and cools

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Convection

• Cool air sinks back to water level
• Air touches the cold water, gives off more heat
  and becomes cold air

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Convection

• Cold air is drawn back up onto the beach to
  replace the hot air that is rising.

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The End
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A Coyle Production