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Specific Heat

Specific Heat. And Temperature Change. Heat. Recall the definition of Heat:. KE. KE. KE. KE. KE. KE. KE. Heat. More KE in the molecules = More Heat Energy Heat: The amount of energy in an object’s molecules Temperature: The speed of an object’s molecules.

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Specific Heat

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  1. Specific Heat And Temperature Change

  2. Heat • Recall the definition of Heat: KE KE KE KE KE KE KE

  3. Heat • More KE in the molecules = More Heat Energy • Heat: The amount of energy in an object’s molecules • Temperature: The speed of an object’s molecules.

  4. Increasing Heat Energy • When heat energy is added to an object, it’s temperature will rise. • How much the temperature rises depends on the object’s SPECIFIC HEAT.

  5. Specific Heat • Specific Heat is given by the variable ‘c’. • The units for specific heat are J/(kg˚C)

  6. Specific Heat • Specific heat: The amount of energy needed to raise 1kg of stuff 1˚C. • For example: It takes 4186J of energy to raise 1kg of WATER 1˚C.

  7. Specific Heat • Some objects are hard to heat up, but they stay hot for a long time H20 Leather car seats Frying pans

  8. Specific Heat • These objects have a HIGH specific heat.

  9. Specific Heat • Some objects are easy to heat up but also cool off very quickly: Air Aluminum Foil

  10. Specific Heat • These objects have a very LOW specific heat.

  11. Heat Energy • We can use specific heat to find out how much heat energy we need to heat something up… • Heat Energy: Q

  12. Formula • Q=mcΔT • Energy (J) = mass (kg)*specific heat*temperature change (˚C)

  13. Example • How much energy will it take to bring 1kg of water from room temperature (22.22˚C) to a boil (100˚C)? Specific Heat of water is 4186 J/(kg˚C)

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