Colorful Time-Lapse of Hot Air Balloons in New Mexico | Short Film Showcase

What is the primary source of heat used to inflate and lift a hot air balloon?

• Solar energy absorbed by the balloon's fabric.

• A large electric heater inside the basket.

• Propane burners that heat the air directly.

• Chemical reactions that produce heat.

What causes a hot air balloon to rise into the sky?

• The balloon has a powerful engine that pushes it up.

• The hot air inside the balloon becomes less dense than the cooler air outside.

• Magnets in the balloon pull it towards the Earth's magnetic field.

• The pilot uses a large fan to blow the balloon upwards.

When the air inside a hot air balloon is heated, how does its density change compared to the cooler air outside?

• It becomes more dense.

• It becomes less dense.

• Its density remains the same.

• Its density fluctuates rapidly.

If the pilot of a hot air balloon allows the air inside the balloon to cool down, what will happen to the balloon?

• It will rise higher.

• It will move faster horizontally.

• It will begin to descend.

• It will become invisible.