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How much does the air above your head weigh?

• 15 tons

• Almost 10 tons

• 5 tons

• 1 ton

What keeps birds and planes aloft?

• Magic

• Hot air

• Helium

• Power to keep air moving over their wings

Why does the atmosphere stay up?

• It's attached to the Earth

• Because of gravity

• Air molecules don't obey gravity

• Magic

Who were responsible for the first human flight?

• Albert Einstein

• Leonardo da Vinci

• The Montgolfier brothers

• The Wright Brothers

What does the ideal gas law tell us?

• How to predict weather

• Everything about gases' behavior

• How to make balloons

• The history of gases

What happens to air molecules when heated in a balloon?

• They move slower

• They freeze

• They move faster and collide with more force

• Nothing changes

Why does a hot air balloon float?

• Because of magic

• Due to gravity

• It's lighter than air

• Helium inside it

What principle explains why ships float?

• Principle of buoyancy

• Ideal gas law

• Principle of relativity

• Law of universal gravitation

What is flying in a hot air balloon compared to?

• Riding a bicycle

• Being a cloud

• Swimming in the ocean

• Driving a car

What do we have in common with fish according to the video?

• We both can swim

• We live in a fluid

• We both have gills

• We are both affected by gravity