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Question:

Are ideal fluids exposed to the atmosphere automatically at atmospheric pressure?

From my textbook on Bernoulli's law, supposedly ideal fluids exposed to the atmosphere are at atmospheric pressure (even if they're not static, e.g. during efflux from the bottom of a large container). Is this actually true? Take a fire hose, for examplethe water closer to the opening of the hose will have a higher pressure than the water slightly further out, so both can't be at 1 atm. The velocities are different as well, so according to Bernoulli's equation, the Ps must necessarily be different, or am I misunderstanding?

Answer:

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