Vaporize

Melt

Heat

Exercise 4.

Exercise 3.

Exercise 2.

Vocabulary Exercises

Exercise 1.Read the texts A, B and mark the sentences true (T) or false (F).

1. As you know, temperature is measured in joules.

2. Heat is temperature, so it’s measured in degrees Celsius.

3. Melting and evaporation are endothermic processes.

4. When substances change their state, heat energy is needed to make a liquid boil, so it evaporates and becomes ice.

5. The amount of energy absorbed while a substance changes state is called latent heat.

6. Electric convectors heat the air and make it transform.

7. The physical phenomenon, where warm gas or liquid moves around and dissipates heat, is called convection.

8. The heating system in a home may circulate hot water through a pipe.

9. The third way that heat is transferred is by evaporation.

10. The radiators act as heat exchangers – devices that transfer heat.

Complete the sentences with the correct form of the words.

1. The __________ systems in homes often have electric convector heaters.

2. The amount of energy absorbed or emitted while a substance changes state during ______ is called latent heat of fusion.

3. The amount of energy absorbed or emitted while a substance changes state during vaporizing is called latent heat of ________.

4. The radiators act as heat exchangers from the hot water inside to the _______ outside.