Atmospheric Pressure and Its Applications

Froggy and Foxy Cat explore atmospheric pressure through experiments with water, mercury, and vacuums. Froggy demonstrates how atmospheric pressure can counteract gravity, explains the concept of a Torricellian vacuum, and shows how pressure changes with volume using a syringe. They discuss real-life applications like drinking with a straw and using suction cups. The lesson concludes with a summary and a brainstorming question.

What does Froggy use to demonstrate the magic trick involving atmospheric pressure?

• A metal plate

• A plastic sheet

• A piece of gauze

• A piece of cloth

What is the height of the mercury column that indicates 1 atmosphere of pressure?

• 120 cm

• 100 cm

• 50 cm

• 76 cm

What did Evangelista Torricelli discover?

• The concept of gravity

• The speed of light

• The magnitude of atmospheric pressure

• The density of water

What happens to the height of the mercury column if the tube is tilted?

• It fluctuates

• It remains the same

• It decreases

• It increases

What is the term for the vacuum created in the upper part of the tube in Torricelli's experiment?

• Mercurial vacuum

• Perfect vacuum

• Partial vacuum

• Torricellian vacuum

Why is it difficult to separate the two hemispheres after creating a partial vacuum inside them?

• The hemispheres are glued together

• The external pressure is higher than the internal pressure

• The internal pressure is higher than the external pressure

• The internal and external pressures are equal

What happens to the pressure of gas in a closed container when its volume decreases?

• The pressure increases

• The pressure remains the same

• The pressure fluctuates

• The pressure decreases

How does atmospheric pressure help in drinking with a straw?

• It balances the liquid

• It evaporates the liquid

• It pulls the liquid up

• It pushes the liquid down

What happens to the pressure on the straw and the drink when the straw is removed from the mouth?

• The pressures fluctuate

• The pressure on the drink decreases

• The pressure on the straw increases

• The pressures become balanced

What is the height of the water column in a tube if mercury is replaced by water?

• 5 meters

• 10 meters

• 15 meters

• 20 meters