What happens to a metal ball when it is heated? What does this show ?

Why does a candle become smaller on burning with time?

Look at the diagram given alongside and answer the questions that follow:

(a) Label A and B.

(b) What is the purpose of this experiment?

Given below is a crossword puzzle based on this lesson. Read the clues across and clues downwards and fill up the blank squares.

Across:

1. Quantity of matter
2. Solid changes directly into vapour
3. Gas changes into liquid

Down:

4. Occupies space and has mass
5. Liquid is heated to change into vapour
6. Solid changes into liquid.