Louis Pasteur; proving his germ theory

The video explores the origins of germ theory, contrasting historical beliefs with the hypothesis that germs are airborne. An experiment is conducted using two flasks: one sterilized and sealed, and the other exposed to ordinary air. The results show that germs grow in the flask with air, while the sterilized flask remains germ-free, proving the airborne theory.

What were some of the early beliefs about the origin of germs?

• They were a result of magic.

• They were caused by bad air or miasma.

• They were brought by animals.

• They were created by sunlight.

What was the narrator's hypothesis about germs?

• Germs are a result of fire.

• Germs float in the air.

• Germs are caused by water.

• Germs are created by decay.

What was done to the first flask in the experiment?

• It was heated and sealed to be sterile.

• It was filled with water.

• It was left open to the environment.

• It was filled with ordinary air.

What was the condition of the second flask in the experiment?

• It was filled with ordinary air.

• It was filled with sterile air.

• It was sealed with no air.

• It was left empty.

What did the experiment prove about the narrator's hypothesis?

• Germs can grow without air.

• Germs are not affected by air.

• Germs are airborne and need air to grow.

• Germs are created by heat.