Entropy Formula

TGIF to my friends Worldwide from Houston, Texas
From:: Dr. TJ Gunn

Entropy Formula

Entropy is a measure how much the energy of atoms and molecules become more spread out in a process and can be defined in terms of statistical probabilities of a system or in terms of the other thermodynamic quantities. The most familiar case is the entropy of an ideal gas.

Entropy = (Boltzmann constant) * logarithm (number of possible states of the system)

The equation is:

S= k Log(Ω)


S: Entropy

k: Boltzmann constant. (1.38*10(-23) J/ K)

Ω: The number of states of the system.


Thermodynamic work Formula Question:

1) If an ideal gas is in a box full, the number of states possible are given by

Ω = V/N((4 π m U)/(3 N h2))(3/2).

For the ideal gas the entropy is, S=N k(Log(Ω )+5/2)

Question: Having 1019 particles of mass 1 gr, with an energy U=500 J, in a volume of 1 m3, what is the entropy the system?

Substituting in Ω the values:

Ω = 1 m3/1019 ((4 * π * 0.001 Kg * 500 J)/(3 * 1019 * (6.62*10(-34)m2 Kg/s)2))(2/3)

Ω = 3.3*10(58) then,

S = 1010 * (1.38*10(-23)J/K)*(Log(3.3*10(58)) + 5/2)


Solve:  S = 0.?? J/K

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