Temperature & Heat

Temperature & Heat

1. Temperature

   • Hotness or coldness of a body
   • Units
     • Kelvin (K)
     • degree Celcius
     • Farenheit
   • Thermometric property
     • Physical property that changes measurably with temperature
     • Calibration curve
   • Scalar quantity

2. Heat

   • Energy due to the movement of molecules within the body
   • Scalar quantity
   • Joules (J)

3. Heat Capacity (C)

   • The amount of heat required to raise the temperature of a body by 1 K
   • J/ K
   • Specific heat capacity (c)
     • Amount of heat required to raise the temperature of 1kg of a substance by 1 K
     • J/ kg/ K
     • Q = mcΔθ
       • m = mass of body
       • c = specific heat capacity
   • Q = CΔθ
     • Q = Energy
     • Δθ = Change in temperature
     • C = Heat capacity

4. Latent Heat

   • Amount of heat required to change a body's state, without a change in temperature
   • Joules
   • Specific latent heat (l)
     • Amount of heat required to change the state of 1 kg of a substance without a change in temperature
     • Specific latent heat of fusion
       • Solid to liquid
     • Specific latent heat of vaporisation
       • Liquid to gas
     • Q = ml

5. Heat transfer

   • Conduction
     • No overall movement of the substance
   • Convection
     • Through movement of circulating fluid
   • Radiation
     • Via electromagnetic waves