1. Heat Diagram of H2O

2. Heat Diagram of H2O

3. Heat Diagram of H2O

4. Questions Regarding the Phase Diagram
1. The phase of water present along "Leg A" of the diagram is:
 ?    vapor
 ?    solid
?    Liquid
2. The phase change taking place, in the right-to-left direction, along Leg "B" is:
  ?    melting
  ?    boiling
  ?    freezing

5. Questions Regarding the Phase Diagram
3. According to the diagram, during a phase change the temperature:
  ?    increases
  ?    remains constant
  ?    Fluctuates
?    decreases
4. At normal atmospheric pressure, water boils at:
  ?    100 ºC
  ?    0 ºC
  ?    -20 ºC
  ?    120 ºC

6. Questions Regarding the Phase Diagram
5. The phase of water present along "Leg E" of the diagram is:
  ?    solid
  ?    vapor
  ?    liquid
6. According to the diagram, freezing requires
  ?    absorption of energy
  ?    no energy change
  ?    removal of energy

7. The Refrigeration Cycle

8. Energy Interchange in a Refrigerator’s Cooling Cycle
Heat is taken in from the inner compartment as the Refrigerant (liquid) evaporates in the pipes (Evaporator) and changes phase to vapor.
The vapor is compressed and then pumped through a heat exchanger pipe assembly (Condenser) where heat is given up to the outside environment allowing the vapor to condense into liquid.