Answer
Liquid pressure changes with depth. A pressure reading measured in the upper arm more closely matches the blood pressure in your heart because they're approximately at the same horizontal level.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 13 - Think and Explain - Page 261-263: 54
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