By Meyers R.A. (ed.)
9 years has handed because the 1992 moment version of the encyclopedia was once released. This thoroughly revised 3rd version, that is a school point compendium of chemistry, molecular biology, arithmetic, and engineering, is refreshed with quite a few articles approximately present examine in those fields. for instance, the hot variation has an elevated emphasis on details processing and biotechnology, reflecting the speedy development of those components. the ongoing Editor-in-Chief, Robert Meyers, and the Board ready a brand new topical define of actual technological know-how and know-how to outline entire insurance. part editors are both Nobel Laureates or editors of key journals of their fields. extra Board individuals representing the worldwide clinical group have been additionally recruited.
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Additional info for Encyclopedia of Physical Science and Technology: Physical Chemistry
Xk−1 are spanning the phase-diagram space. In order to transform the set of k + 2 variables of Eq. (116) to these reference variables, the chemical potential of component Yi in phase β is written (β) (β) dµi k−1 + ∂µi ∂T dp + T,x j d xs(β) ∂ xs p,T,x j =xs k−1 (β) = Vi dT p,x j (β) ∂µi (β) s=1 FIGURE 6 Phase diagram of water. Ice modifications: I, II, III, V, VI, VII. 16 K. 2 K. 218 kbar), and the sublimation pressure curve. ). The vapor pressure curve (equilibrium: 1 ← → g) terminates in a critical point C.
122) the stoichiometric coefficients ωi are positive for the final and negative for the initial products. The P1: FYD Revised Pages Encyclopedia of Physical Science and Technology EN002-101 May 17, 2001 20:51 783 Chemical Thermodynamics internal variable ζ of chemical reactions is given by the relation dζ = dn i /ωi be taken into account with the help of the corresponding transfer quantities, H (α→β) and V (α→β) , respectively. (123) 3. Heat Balance of Chemical Reactions yielding the expression dU = − p d V + T d S − A dζ (124) for the internal energy, where At constant pressure and temperature the Gibbs energy of reaction R G equals the negative affinity [Eqs.
67b), showing the pressure dependence of the chemical potentials, to yield the relation RT d ln xi(1) f i(1) pi φi∗ = −Vi∗(1) d p (138) Integration from xi(1) = 1 (where Pi = pi∗ ) to an arbitrary mole fraction xi(1) (partial pressure in the gas phase pi ) yields the relation xi(1) f i(1) = pi φi exp pi∗ φi∗ pi∗ pi Vi∗(1) dp RT (139) The exponential term in Eq. (139), commonly called the Poynting correction, differs little from unity for temperatures not near the critical temperature. Assuming ideal behavior of the gas phase, fugacities can be replaced by pressures.