That is, Eb = -(oP)sf(dvfv)s, where the minus sign indicates the inverse relationship between pressure P and volume v, and subscript s indicates the isentropic restriction. This restriction means that the equation pertains to processes which occur both adiabatically and reversibly, conditions met in the compressions associated with the propagation of sound. In terms of density, p = 1/v, and on logarithmic differentiation (that is, taking the logarithm and differentiating) dvjv = -dpjp. Making Substitutions in equation (3-26), a = (oPfop)1'2 • (3-27) Equation (3-27) is written in coherent units and applies to any medium whether or not an ideal gas. 3-18) (3-19) (3-20) Isentropic Relations A process that is thermally isolated (adiabatic) and nondissipative (mechanically reversible) is identified in thermodynamic parlance as isentropic (equal entropy). Isentropic changes in general involve compressions or expansions, and mathematical expressions for the pressures, temperatures, and densities during isentropic expansions or compressions are needed.

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Theseexpressions are readily deduced for the ideal gas from the mathematical definition of the entropy as given by equation (3-13). 448 = 223 g/mol. 26; and for oxygen, 6. The apparent formula becomes C 3 _98 H 5. 88)/223 = -6%. 88)/223 = -35%.

These indicate a moderately oxygen-deficient explosive. EXAMPLE 2-3: The heat of combustion at constant pressure for TNT is listed in Reference 5 as 3620 cal/g. This is the negative of its enthalpy of combustion.

What internal energy of formation corresponds to this heat of combustion? Installation Procedures Aluminium Composite Panel. H, of- 3440 kJ/mol, or a decrease in system enthalpy.