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Why is the pressure at the low end of the fire pipeline high and there is no pressure at the high end?

The following reasons lead to:

1. Gravity effect: The water in the fire pipeline is subjected to gravity, and when the pipeline is downward or in a lower position, it is subjected to greater water pressure.

2. Inertia effect: When the water in the fire pipeline flows, the inertia of the water will lead to the increase of the low-end pressure.