Specific Heat Capacity

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Specific Heat Capacity
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Specific Heat Capacity

• The amount of heat required to change the
  temperature of a unit of mass of a substance by 1
  degree
• Thermal Inertia
• Resistance to temperature change
• An object with a high specific heat capacity
• Requires a lot of energy to increase in
  temperature by 1 degree
• Releases a lot of energy as it decreases in
  temperature by 1 degree

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Q mc?T

• Q heat
• Joules or calories
• m mass
• kg or g
• c specific heat capacity
• J/kg?C or cal/g?C
• ?T change in temperature

• Example
• If 100 calories of heat are added to 5 grams of
  10C water, what is the final temperature of the
  water? (the specific heat of water 1 cal/gC)

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Heat Transferring

• If two objects with different temperatures are in
  thermal contact heat transfers from the hot
  object to the cold object unit the temperatures
  are the same.
• The heat lost by the hot object equals the heat
  gained by the cold object.

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Qlost Qgained

• Example
• Gwyns bowl is filled with 175 g of 60.0ºC soup
  (mostly water) that she stirs with a 20.0ºC
  silver spoon with a mass of 40 g. The spoon
  slips out of her hand and slides into the soup.
  What equilibrium temperature will be reached if
  the spoon is allowed to remain in the soup and no
  heat is lost to the outside air? (cspoon .057
  cal/gºC, cwater 1 cal/gºC) Assume that the
  temperature of the bowl does not change.