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Modern Thermodynamics for Chemists and Biochemists$
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Dennis Sherwood and Paul Dalby

Print publication date: 2018

Print ISBN-13: 9780198782957

Published to Oxford Scholarship Online: August 2018

DOI: 10.1093/oso/9780198782957.001.0001

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The First Law of Thermodynamics

The First Law of Thermodynamics

Chapter:
(p.93) 5 The First Law of Thermodynamics
Source:
Modern Thermodynamics for Chemists and Biochemists
Author(s):

Dennis Sherwood

Paul Dalby

Publisher:
Oxford University Press
DOI:10.1093/oso/9780198782957.003.0005

The First Law of Thermodynamics, and how the First Law relates a change in a state function, internal energy, to changes in the path functions work and heat. Thermodynamic cycles. Heat capacities at constant volume, and the definition CV = (∂U/∂T)V. Mathematics of internal energy. Examples of the application of the First Law to isothermal, isobaric, isochoric and adiabatic changes. Reversible and irreversible paths. Mixing and friction as irreversible processes. Proof that that any path involving friction (or any other dissipative process) must be irreversible, implying that all real paths are irreversible.

Keywords:   First Law of Thermodynamics, internal energy, heat capacity at constant volume, isothermal, isochoric, isobaric, adiabatic, reversible path, irreversible path, mixing, friction

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