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4.3 UNDERSTANDING 
SPECIFIC LATENT HEAT
CHANGE OF PHASE & LATENT HEAT 
MATTER 
SOLID LIQUID GAS 
The change of one phase to another phase of 
matter happens at a SPECIFIC TEMPERATURE 
and PRESSURE. The change happens with the 
ABSORPTION or RELEASE of heat followed by a 
change in the volume and density of the 
substance
LATENT HEAT(hidden heat) 
Total energy absorbed or released 
when a substance changes its physical 
state completely at a constant 
temperature. 
(a)LATENT HEAT OF FUSION 
The heat absorbed by melting solid 
(b)LATENT HEAT OF VAPORISATION 
The heat absorbed during boiling
FUSION (Melting) 
ABSORBS 
Latent heat of 
fusion 
VAPORISATION 
(Boiling) 
ABSORBS 
Latent heat of 
vaporisation 
RELEASES RELEASES 
SOLIDIFICATION 
(Freezes) 
CONDENSATION 
(Condenses)
HEATING &COOLING CURVES
CHAPTER 4:HEAT-Specific latent heat
HOW TO CALCULATE?
SPECIFIC LATENT HEAT 
Specific latent heat of fusion,l 
SPECIFIC LATENT HEAT OF FUSION, l is the 
quantity of heat energy required to change 
1kg solid to liquid at a constant temperature. 
Q=heat energy,J 
m=mass,Kg 
l=specific latent heat fusion,l 
P=power of electric,W 
t=heating time,s 
If heat energy supplied by an electric immersion heater 
Q=Pt 
#Pt=ml
SPECIFIC LATENT HEAT OF 
VAPORISATION,L 
• Is defined as the quantity of heat energy 
required to change a 1 kg liquid to vapour at a 
constant temperature. 
Q=ml 
if supplied by immersion heater, 
Q=Pt 
Pt=ml
CHAPTER 4:HEAT-Specific latent heat
#When question involve change in 
temperature, Q=mc< 
#when question involve change in 
phase,Q=ml 
#when involve both use, Q=mc< and 
Q=ml
CHAPTER 4:HEAT-Specific latent heat
CHAPTER 4:HEAT-Specific latent heat
CHAPTER 4:HEAT-Specific latent heat
CHAPTER 4:HEAT-Specific latent heat
CHAPTER 4:HEAT-Specific latent heat
CHAPTER 4:HEAT-Specific latent heat
CHAPTER 4:HEAT-Specific latent heat
CHAPTER 4:HEAT-Specific latent heat
CHAPTER 4:HEAT-Specific latent heat
CHAPTER 4:HEAT-Specific latent heat

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CHAPTER 4:HEAT-Specific latent heat

  • 2. CHANGE OF PHASE & LATENT HEAT MATTER SOLID LIQUID GAS The change of one phase to another phase of matter happens at a SPECIFIC TEMPERATURE and PRESSURE. The change happens with the ABSORPTION or RELEASE of heat followed by a change in the volume and density of the substance
  • 3. LATENT HEAT(hidden heat) Total energy absorbed or released when a substance changes its physical state completely at a constant temperature. (a)LATENT HEAT OF FUSION The heat absorbed by melting solid (b)LATENT HEAT OF VAPORISATION The heat absorbed during boiling
  • 4. FUSION (Melting) ABSORBS Latent heat of fusion VAPORISATION (Boiling) ABSORBS Latent heat of vaporisation RELEASES RELEASES SOLIDIFICATION (Freezes) CONDENSATION (Condenses)
  • 8. SPECIFIC LATENT HEAT Specific latent heat of fusion,l SPECIFIC LATENT HEAT OF FUSION, l is the quantity of heat energy required to change 1kg solid to liquid at a constant temperature. Q=heat energy,J m=mass,Kg l=specific latent heat fusion,l P=power of electric,W t=heating time,s If heat energy supplied by an electric immersion heater Q=Pt #Pt=ml
  • 9. SPECIFIC LATENT HEAT OF VAPORISATION,L • Is defined as the quantity of heat energy required to change a 1 kg liquid to vapour at a constant temperature. Q=ml if supplied by immersion heater, Q=Pt Pt=ml
  • 11. #When question involve change in temperature, Q=mc< #when question involve change in phase,Q=ml #when involve both use, Q=mc< and Q=ml