Some molecules at the surface, however, will have sufficient kinetic energy to escape from the liquid and form a vapor, thus increasing the pressure inside the container. S(N, U, V) NkB ln( V N)(U N) 1 1 (6.3.9) One thing to note here is that while the ideal gas law state equation is the same for all ideal gases, the state equation for entropy depends upon the type (monatomic, diatomic, etc) of ideal gas, as evidenced by the presence of the constant. We can develop an alternative form in terms of pressure and volume, which allows us. This is certainly not as intuitive as molecular kinetic energy, but in thermodynamic applications it is more reliable and more general. We will use the change in entropy formula: s Cp × ln(Tf / Ti), where Tf and Ti indicate the final and the initial temperature, respectively. The absolute entropy (3) of a substance, ST, is the increase in entropy when a substance is heated from 0 K to a temperature of T K. 2 Answers Sorted by: 3 I have read the Entropy is defined by: S Q/T Entropy is not defined by that equation. This expression gives entropy change in terms of temperature and volume. \)), the initial pressure above the liquid is approximately zero because there are as yet no molecules in the vapor phase. Temperature is expressed as the inverse of the rate of change of entropy with internal energy, with volume V and number of particles N held constant.
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