Understanding Pressure and Balloons

Carlos Villa introduces the concept of pressure using a balloon. He explains that a balloon stays inflated due to the air inside pushing against its walls, balanced by the external air pressure. By placing balloons in a vacuum chamber, he demonstrates how removing external pressure causes the balloons to expand. The video concludes with a note on how sound cannot travel in a vacuum, as demonstrated by the muted sound of popping balloons.

What is the main reason a balloon stays inflated?

• The material of the balloon is very strong.

• There is air inside the balloon pushing against its walls.

• The balloon is tied tightly.

• The balloon is filled with water.

What role does the air outside the balloon play?

• It pushes on the inside of the balloon.

• It has no effect on the balloon.

• It makes the balloon heavier.

• It keeps the balloon from floating away.

What happens to the balloon when the external pressure is removed?

• It stays the same size.

• It shrinks.

• It expands.

• It pops immediately.

How is the external pressure removed in the demonstration?

• By heating the balloon.

• By using a vacuum chamber.

• By adding more air inside the balloon.

• By puncturing the balloon.

Why do the balloons expand in the vacuum chamber?

• The temperature inside the chamber increases.

• The balloon material becomes more elastic.

• The pressure inside the balloon becomes greater than the pressure outside.

• The air inside the balloon is removed.

What happens to the balloons when air is slowly let back into the vacuum chamber?

• They stay the same size.

• They pop.

• They shrink back to their normal size.

• They expand further.

Why won't you hear much if the balloons pop in the vacuum chamber?

• The balloons are made of a special material.

• Sound does not travel in a vacuum.

• The vacuum chamber is soundproof.

• The balloons are very quiet.

What is the purpose of using a vacuum chamber in the demonstration?

• To change the color of the balloons.

• To heat the balloons.

• To remove the air outside the balloons.

• To add more air inside the balloons.