How Can Heat be Transferred?

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How Can Heat be Transferred?
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Temperature and Heat

• What measures the temperature of matter?
• Thermometer
• Temperature of matter is caused by particles
  moving very quickly. The more energy they have
  the more they move.
• Experiment Slowly move your hands against each
  other. Are your hands very warm? Now move your
  hands against each other rapidly. Which movement
  makes your hands warmer?

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Whats the Matter?

• In solid matter the particles cannot move very
  far because they have no place to go.
• What do you think happens in liquid or gas
  matter?
• In both types of matter the particles can move
  more rapidly releasing more energy.
• Food for thought Which takes longer to heat up
  in the microwave a potato or a glass of water?

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Food for Thought

• The potato takes longer to heat up because it is
  made of solid matter. The particles cannot move
  as quickly through solid than liquids.

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What is Heat?

• Heat is the transfer of energy.
• Think about a hot summer day and you decide to
  jump in a swimming pool to cool off. How do you
  feel when your body hits the water?
• Well, energy is moving from your body into the
  water.

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How does heat travel?

• Convection The movement of heat in liquids and
  gases from a warmer area to a cooler area.
• Example boiling water in a pot of water on a
  stove

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Another type of heat transfer

• Conduction the movement of between two materials
  that are touching.
• Example A hot spoon in a bowl of spoon. The
  spoon is hot and its heat is transferred to the
  spoon.

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Third type of heat transfer

• Radiation the movement of heat without matter to
  carry it.
• Example The suns energy is release through heat
  (light), and it travels through space (not
  considered matter) to the earth.

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Remember

• Heat always moves from warmer matter to matter
  that is cooler.
• Think about a hot cup of chocolate that has been
  out on the counter for 1 hours. What happens to
  the liquid?