Specific Latent heat

• The specific latent heat of a substance is the amount of energy required to change the heat of 1kg of a substance at a constant temperature
• Energy = mass x Specific latent heat
• What is short for the equation

  energy = mass x specific latent heat?

  E = m x L
• What is the unit for energy?

  J
• What is the unit for mass?

  KG
• What is the unit for specific latent heat?

  J/KG
• How can we measure mass?

  by using a top pan balance
• How much energy is absorbed by 50g of ice during the melting process? The specific latent heat of fusion of water is 333J/g

  Energy = mass x specific latent heat

  50 x 333

  = 16,650J
• Water in a Kettle boiled for a short time, during this time, 5.0g of water changed to steam. The specific latent heat of Vaporisation of water is 2,260,000J/KG

  calculate the energy transferred to change the water to steam

  energy = mass x specific latent heat

  5.0 x 2,260,000

  = 11,300,000J