By Marcus Karel

ISBN-10: 0824740637

ISBN-13: 9780824740634

ISBN-10: 0824755790

ISBN-13: 9780824755799

Examines the houses, stipulations, and theoretical rules governing the protection and efficacy of assorted nutrition protection, garage, and packaging innovations. Qualitatively and quantitatively formulates the rules of nutrients renovation and garage balance. bargains step by step element on conventional and rising renovation techniques together with dehydration, heating, freezing, focus, irradiation, and high-pressure processing.

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Extra info for Physical Principles of Food Preservation: Revised and Expanded

Example text

Since we can define a reversible path exactly and calculate the work in moving along it, we can ultimately compare our real Thermodynamics 3 processes to the ideal reversible process to assess the efficiency of alternative real processes. If the work done is of the pressure-volume type (as distinguished from kinetic energy, potential energy, or frictional energy), the system is closed, the process is reversible, and the pressure is constant, then Eq. , work is done on the system). For expansion, dV .

The rate constant k is a function of environmental conditions including temperature. Most chemical reactions are reversible at least to some extent, and the ratio of the rate of the forward reaction to the rate of the backward reaction is the equilibrium constant. K¼ k1 k2 or k21 k22 ð3Þ For many reactions in which we have primary interest, the rate of the reverse (backward) reaction is very small compared to the forward reaction and, at least initially, the concentration of product [P] is zero.

0108 Thermodynamics 17 FIGURE. 1 Phase diagram of water. 5 atm). A. Liquid-Vapor Equilibria For phase equilibria between liquid and vapor, the free energy per mole must be the same in both phases. If this were not the case, then the system would spontaneously adjust to achieve equal free energy in both phases. Thus at some P and T, g  GlA ¼ G A ð62Þ If T and P are both shifted some infinitesimal amount so that the molar free energies become GL þ dGL and GV þ dGV, then the equilibrium condition will still hold and GL þ dGL ¼ GV þ dGV ð63Þ From Eq.

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Physical Principles of Food Preservation: Revised and Expanded by Marcus Karel

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