Heat and Heat Transfer

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Heat and Heat Transfer

• Heat

2
Announcements

• Vocab quiz tomorrow!
• Heat exam on Friday!

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Scales of Measurement

• Celsius scale based on where water freezes
  (0?C) and where water boils (100?C)
• Kelvin scale based on the movement of particles

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Absolute Zero

• At 0 K, all particle movement has ceased
• It is impossible to have a temperature lower than
  0 K
• 0 K -273?C

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Kinetic-Molecular Theory

• The faster particles move, the greater the
  kinetic energy or thermal energy.

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Definitions

• Temperature average kinetic energy of the
  particles in a substance
• Thermometers measure temperature
• Heat amount of energy transferred

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Thermal equilibrium

• Energy will always travel from an area of higher
  energy to an area of lower energy.

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Heat transfer

• Conduction energy transfer between solids.
• Convection mass motion of a fluid (liquid or
  gas)
• Radiation emission of EM waves, no medium
  needed

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Specific Heat

• Amount of energy that must be added to the
  material to raise the temperature of a unit mass
  one temperature unit.
• The units of specific heat are J/kgK or J/kgC

10
Law of Conservation of Energy

• Energy lost by one object must be equal to the
  amount gained by another object.