Apperception

• Why does the balloon blow up when it is heated?

• Why can the zeppelin balloon go up ?

EXPANSION GASES

Objective• Design simple experiment to

investigate the expansion of gases

• Explain the principles of thermal expansion of gases

Activity• Using your Student Worksheet Using your Student Worksheet

11.711.7

(page 129)(page 129)

• Do the experiment in your Do the experiment in your groupgroup

Water Surface

Resume• The volume of gas will increase

if it is heated and decrease if it is cooled.

• Gases do not have linear and area expansion.

• Volume expansion coefficient of all gas is 1/273 /oC or 0.00367/oC

Application

• Hot air balloon

• When the air inside a balloon is heated, its density becomes smaller than the air of the surrounding.

• The uplift from the surrounding air causes the balloon flies.

Application