Bi ht: Listening Practice Through Dictation CD 1-08 - V.A

Unit 8 Bubbles in Boiling Water
G : Where do the bubbles come from when you
boil water?
Water is a liquid. When it is heated, it moves
around faster and faster. When it starts to boil,
the liquid turns into a gas. This gas is called
water vapor. This gas is lighter than the water
around it. It rises to the top. Then it disappears
into the air.
As the water gets hotter and hotter, it starts
turning into gas very quickly. A lot of bubbles
form at the same time. All these bubbles try to
escape at once. The bubbles push the water out
of the way and jump out. This is what we call
boiling water.
More and more water turns into gas. More
of it disappears into the air. After a while, every
drop of the water will be gone. Try it and see!