Thursday 03/05/2018

Thursday, 3 May 2018

11:07 AM

Specific Heat

Q=mc

 

Phase Changes

• When a substance changes from one form to another
• Internal structure and energy change, but no temperature changes

 

Latent Heat - L

• Different substances react differently to the energy added or removed during a phase change due to their different molecular arrangements
• The amount of energy also depends on the mass of the sample
• If an amount of energy Q is required to change the phase of a sample of mass m, then L=Q/m

 

• Q=mL
• Fusion => Solid to liquid
• Vaporisation => Liquid to gas

# when to use latent heat