The density of mercury changes approximately linearly with temperature as Hg = 851.5 - 0.086 T lbm/ft3

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The density of mercury changes approximately linearly with temperature as

ρHg = 851.5 - 0.086 T lbm/ft3 T in degrees Fahrenheit
so the same pressure difference will result in a manometer reading that is influenced by temperature. If a pressure difference of 14.7 lbf/in.2 is measured in the summer at 95 F and in the winter at 5 F, what is the difference in column height between the two measurements?
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Fundamentals of Thermodynamics

ISBN: 978-0471152323

6th edition

Authors: Richard E. Sonntag, Claus Borgnakke, Gordon J. Van Wylen

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