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The flask that was not exposed to air/germs and remained sealed represents the control in Louis Pasteur's experiment. This flask helped to demonstrate that it was the air/germs that caused the spoilage and not just the broth itself.
A flat bottom flask would be an Ehrlemeyer flask, which is used quite a lot by chemists.anf
volumetric flask
131.5 mL is equal to 0.1315 L, so the volume of the flask in liters is 0.1315 L.
A vented flask is generally used in laboratory applications to allow gases to escape during heating or mixing processes, preventing pressure build-up. This type of flask helps to control reactions and manage volatile substances more effectively.