Now let's add some fluid flow. As the faucet is turned on, the screw makes the rubber stopper back away from the opening, creating a small crack through which you — the water molecule — and a few thousand of your friends can pass. The pressure inside the pipe drops as you go through the opening.
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Answer:
Now let's add some fluid flow. As the faucet is turned on, the screw makes the rubber stopper back away from the opening, creating a small crack through which you — the water molecule — and a few thousand of your friends can pass. The pressure inside the pipe drops as you go through the opening.