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- 2. Thermodynamics and Physical Statistics Thermodynamic Approach - defines correlations between the observed physical quantities (macroscopic), relies
- 3. Statistical Approach - Based on certain models of the micro-structure of matter defines correlations between the
- 4. Thermodynamics and Physical Statistics Statistical approach strongly complements thermodynamics. BUT! To implement it effectively we need
- 5. Probability = the quantitative measure of possibility for certain event to occur. EXAMPLE 1. Eagle and
- 6. Probability = he quantitative measure of possibility for certain event to occur. EXAMPLE 2. Dice game.
- 7. EXAMPLE 3. Rotating of a top toy. If initially the red mark was exactly to the
- 8. Distribution of Probabilities X φ SO: the PROBABILITY for the top toy to stop between φ
- 9. Even Distribution on the Plane EXAMPLE 4: a point is dropped (randomly) on the table with
- 10. Even Distribution in Physics EXAMPLE 5: Molecules in gas – at the state of thermal equilibrium,
- 11. THE PROPERTIES OF AVERAGES. Average of the sum of two values equals to the sum of
- 12. Probability Distribution and Average Values Examples: in case of even distribution of molecules over certain spherical
- 13. Different Kinds of Averages Y X Z V = = 3R/4 - average ( )1/2 =
- 14. Eagle and Tails game Normal Distribution
- 15. Eagles and Tails Game EXAMPLE 1: One throw of a coin = one Test (N =
- 16. EXAMPLE 2: 1 Test (or one series of tests) = 2 throws of a coin (N
- 17. The product of probabilities: The first test – the probability of result “1” - P1 The
- 18. General Case: The test length = N (N throws = 1 test) All the types of
- 19. The test series has the length N (N throws = attempts) Number of variants to obtain
- 20. BAR CHART Smooth CHART – distribution function x x+a ΔP x SOME MATHEMATICS: the probability distribution
- 21. N – number pf tests, Ni – number of results of the type i Рi –
- 22. Normal distribution The normal (or Gauss) distribution – is the smooth approximation of the Newton’s binomial
- 23. Gauss Distribution The normal distribution is very often found in nature. Examples: Eagle and Tails game
- 24. Normal (Gauss) Distribution and Entropy MEPhI General Physics
- 25. Number of variants leasing to the result k (if N =10): Ωk= N!/k!(N-k)! Normal Distribution. EXAMPLE:
- 26. The Entropy of Probability The definition of the entropy of probability: S(k) = ln(Ωk) - N
- 27. Entropy in Informatics Type of result Realizations k = 0 0000000000 k = 1 1000000000 0100000000
- 28. Entropy in Informatics Any information or communication can be coded as a string of zeroes and
- 29. The deffinition of entropy as the measure of disorder (or the measure of informational value) in
- 30. Statistical Entropy in Physics MEPhI General Physics
- 31. Distribution of Molecules over possible “micro-states” Imagine that we have К possible “states” and we have
- 32. Statistical Entropy in Molecular Physics: the logarithm of the number of possible micro-realizations of a state
- 33. Entropy is the additive quantity. J/К Statistical Entropy in Physics. For the state of the molecular
- 34. Not a strict proof, but plausible considerations. ~ Statistical Entropy and the Entropy of Ideal Gas
- 35. ~ Statistical Entropy and the Entropy of Ideal Gas Ω~ VNTiN/2 /N!; S=k ln Ω =kNln(VTi/2/NC)=
- 36. 2nd Law of Thermodynamics and the ‘Time arrow’ “The increase of disorder, or the increase of
- 37. The Distributions of Molecules over Velocities and Energies Maxwell and Boltzmann Distributions That will be the
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