Bernoulli's Law Demonstration

Bernoulli's Law states that

Fast flowing air creates an area of low pressure while slow moving air creates relative high pressure.

This law underlies the fact that a large plastic bag can be totally inflated with just one breath.

Hold the end of the bag tightly against your lips and attempt to inflate the bag. You find that it takes several deep breaths to complete the task.

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Now hold the plastic bag open and blow air down the middle of the opening. You find that the bag inflates with just one breath.

Explain why, using Bernoulli's Law.

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Bernoulli's Law and flight