By Laszlo Tisza

"In spite of the very huge variety of books facing thermodynamics and statistical physics, there continues to be room for brand new contributions. This booklet, by means of a latest grasp of thermodynamics, can particularly lay declare to being this type of contribution. "The publication takes the shape of a suite of papers roughly built-in with each other yet now not thoroughly so. that's, there are lengthy commentaries set out as papers which serve to attach reprints of the author's unique examine, and which additionally offer old info and history. certainly, it's the fascinating mix of ancient info with recognition to the character of the postulates required and with emphasis at the logical constitution of the thermodynamic thought that makes this publication so beneficial. as well as an outline of classical thermodynamics, there also are papers facing the statistical thermodynamics of equilibrium phenomena, severe fluctuations, and the function of fluctuations in irreversible phenomena. "In the area of equilibrium concept, Professor Tisza discusses his personal extensions of that idea, particularly the position of non-classical variables that account for symmetry houses of a medium." —American Scientist

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6. Van der Waals gases. The thermal equation of state for real gases was approximated by van der Waals in the well-known expression p+a N V 2 (V − bN ) = NRT, where a and b are positive constants, ﬁxed for each particular gas, which are, respectively, related to the attractive and repulsive intermolecular forces and are null for ideal gases. 4, show that the caloric equation of state U = U (T, V, N ) has the form U (T, V, N ) = Uid (T, N ) − a N2 , V with Uid (T, N ) is the internal energy for ideal gases.

Therefore, an increase of temperature at constant pressure will shift the reaction in the direction corresponding to endothermic reaction (rT,p < 0). This is in the direction in which heat is absorbed, thus opposing the increase of temperature. Similar results are obtained by varying the pressure: an increase of pressure at constant temperature will cause the reaction to progress in the direction leading to a diminution of volume, thus weakening the action of the external eﬀect. These are particular examples of the more general principle of Le Chatelier stating that any system in chemical equilibrium undergoes, under the eﬀect of external stimuli, a compensating change which will be always in the opposite direction.

67) and assuming that each component is well described by the ideal gas model, the law of mass action is x2HCl = K(T, p). 81) to be solved for the unknowns (ξ1 )eq , (ξ2 )eq , . . , (ξr )eq . 2 Heat of Reaction and van’t Hoﬀ Relation Most of the chemical reactions supply or absorb heat, thus the heat of reaction is an important notion in chemistry. 83) with the enthalpy H given by the equation of state H = H(T, p, ξ), whose diﬀerential form is dH = ∂H ∂T dT + p,ξ ∂H ∂p dp + T,ξ ∂H ∂ξ dξ. 85) where Cp = (∂H/∂T )p,ξ , hT = (∂H/∂p)T,ξ − V , and rT,p = −(∂H/∂ξ)T,p designate the speciﬁc heat at constant pressure, the heat compressibility and the heat of reaction at constant temperature and pressure, respectively.