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Concepts in Thermal Physics$
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Stephen J. Blundell and Katherine M. Blundell

Print publication date: 2009

Print ISBN-13: 9780199562091

Published to Oxford Scholarship Online: February 2010

DOI: 10.1093/acprof:oso/9780199562091.001.0001

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(p.56) 6 Pressure
Concepts in Thermal Physics

Stephen J. Blundell (Contributor Webpage)

Katherine M. Blundell (Contributor Webpage)

Oxford University Press

This chapter discusses pressure. One of the most fundamental variables in the study of gases is pressure. The pressure p due to a gas (or in fact any fluid) is defined as the ratio of the perpendicular contact force to the area of contact. The unit is therefore that of force (N) divided by that of area (m2) and is called the pascal (Pa = Nm-2). The direction in which pressure acts is always at right angles to the surface upon which it is acting. Molecular distributions, the ideal gas law, and Dalton's law are discussed.

Keywords:   molecular distributions, ideal gas law, Dalton's law, pressure

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