Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 13 - Think and Discuss: 103

Answer

"Water seeks its own level" because pressure depends on depth. Consider the hose filled with water, often used as a level. If there is more pressure on one side, the water there pushes water up on the other side until the pressures are equal, at which point their heights are equal. This allows you to determine equal elevations at distant points.
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