Thermal Energy. Related to particle movement and how atoms are bound together Related to particle movement and how atoms are bound together More movement.

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Presentation transcript:

Thermal Energy

Related to particle movement and how atoms are bound together Related to particle movement and how atoms are bound together More movement of particles = higher kinetic energy = higher temperature More movement of particles = higher kinetic energy = higher temperature Thermal Energy = energy in the form of heat Thermal Energy = energy in the form of heat

Where is Thermal Energy produced?

Thermal Energy transfers (moves) as heat from a material at a higher temp. to a material at a lower temp. Thermal Energy transfers (moves) as heat from a material at a higher temp. to a material at a lower temp. **Heat Transfer** **Heat Transfer** Examples: touching cup of hot chocolate, sticking hand in snow Examples: touching cup of hot chocolate, sticking hand in snow

Heat transfer occurs in 3 ways: Conduction, Convection, Radiation Heat transfer occurs in 3 ways: Conduction, Convection, Radiation

Measuring Thermal Energy Different materials need different amounts of heat to produce changes in temp. Different materials need different amounts of heat to produce changes in temp. Ex: swimming pools, aluminum Ex: swimming pools, aluminum

Specific Heat (C) = amount of energy it takes to raise the temp. of an object/substance Specific Heat (C) = amount of energy it takes to raise the temp. of an object/substance Units: J/kg. K Units: J/kg. K Ex: Swimming pool = high specific heat, silver = low specific heat Ex: Swimming pool = high specific heat, silver = low specific heat

Q = m x T x C Q = m x T x C Q = change in thermal energy (Heat loss or gain) (J) Q = change in thermal energy (Heat loss or gain) (J) M = mass (kg) M = mass (kg) T = change in temp. (Final – Beginning) T = change in temp. (Final – Beginning) C = Specific Heat (always given) C = Specific Heat (always given)

1) A 32g silver spoon cools from 60 0 C to 20 0 C. What is the change in thermal energy? (Specific Heat of Silver = 235) 1) A 32g silver spoon cools from 60 0 C to 20 0 C. What is the change in thermal energy? (Specific Heat of Silver = 235)

2) A 0.38 kg drinking glass is filled with a hot liquid. The liquid transfers 7032 J of energy to the glass. If the temperature of the glass increases by 22K, what is the specific heat of the glass? 2) A 0.38 kg drinking glass is filled with a hot liquid. The liquid transfers 7032 J of energy to the glass. If the temperature of the glass increases by 22K, what is the specific heat of the glass?