Question

Pressure gauge, what change can we observe when the valve in this arrangement is opened? Why?

Answer 1

Answer:

On an air compressor, there is a valve that regulates the pressure. If you open the valve, the pressure increases.

Explanation:

This is because the mass flow rate at any given cross section of the pipe should remain same. So if you decrease the area, less mass will go through per second. To compensate for that velocity increases.

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