Specific latent heat: Particle model of matter: Physics: GCSE (9:1)

• Latent heat

  The energy required or released when a substance changes state

  
• What temperature do changes of state occur at?

  At fixed temperatures

  
• Specific latent heat


  The amount of energy required to change the state ofone kilogram(1 kg) of the substance withno change in temperature

  
• Specific latent heat of fusion

  The energy required when a substance changes from a solid to a liquid (or the energy released when a substance changes from a liquid to a solid)

  
• Specific latent heat of vaporisation

  The energy required when a substance changes from a liquid to a gas (or the energy released when a substance changes from a gas to a liquid)

  
• E = mL

  The equation linking energy (for a change of state), mass and specific latent heat

  
• E


  The symbol for energy
• m


  The symbol for mass
• L


  The symbol for specific latent heat
• Joules (J)

  The SI unit for energy and work

  
• Kilograms (kg)


  The SI unit for mass

  
• Joules per kilogram (J/kg)


  The SI unit for specific latent heat
• How does changing the internal energy of a substance affect it?

  The substance will change temperature or change state

  
• What does the specific heat capacity of a substance tell us ?

  The energy required (per kilogram) for the substance to change temperature
• What does the specific latent heat of a substance tell us ...

  The energy required (per kilogram) for the substance to change state