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  2. Maxwell–Boltzmann statistics - Wikipedia

    en.wikipedia.org/wiki/Maxwell–Boltzmann_statistics

    Shown: distribution of speeds for 10 6 oxygen molecules at -100, 20, and 600 °C. In statistical mechanics, Maxwell–Boltzmann statistics describes the distribution of classical material particles over various energy states in thermal equilibrium. It is applicable when the temperature is high enough or the particle density is low enough to ...

  3. Mass distribution - Wikipedia

    en.wikipedia.org/wiki/Mass_distribution

    A surface mass on a surface given by the equation f (x, y, z) = 0 may be represented by a density distribution g(x, y, z) δ(f (x, y, z)), where / | | is the mass per unit area. The mathematical modelling can be done by potential theory , by numerical methods (e.g. a great number of mass points ), or by theoretical equilibrium figures.

  4. Boltzmann's entropy formula - Wikipedia

    en.wikipedia.org/wiki/Boltzmann's_entropy_formula

    We would first like to calculate the permutations 𝒫 for the state distribution characterized by w 0 molecules with kinetic energy 0, w 1 molecules with kinetic energy ϵ, etc. … “The most likely state distribution will be for those w 0 , w 1 … values for which 𝒫 is a maximum or since the numerator is a constant, for which the ...

  5. Maxwell–Boltzmann distribution - Wikipedia

    en.wikipedia.org/wiki/Maxwell–Boltzmann...

    This distribution is used for describing systems in equilibrium. However, most systems do not start out in their equilibrium state. The evolution of a system towards its equilibrium state is governed by the Boltzmann equation. The equation predicts that for short range interactions, the equilibrium velocity distribution will follow a Maxwell ...

  6. Effective mass (solid-state physics) - Wikipedia

    en.wikipedia.org/wiki/Effective_mass_(solid...

    The effective mass is used in transport calculations, such as transport of electrons under the influence of fields or carrier gradients, but it also is used to calculate the carrier density and density of states in semiconductors. These masses are related but, as explained in the previous sections, are not the same because the weightings of ...

  7. Mass balance - Wikipedia

    en.wikipedia.org/wiki/Mass_balance

    where w C, w H, w S, w O refer to the mass fraction of each element in the fuel oil, sulfur burning to SO 2, and AFR mass refers to the air-fuel ratio in mass units. For 1 kg of fuel oil containing 86.1% C, 13.6% H, 0.2% O, and 0.1% S the stoichiometric mass of air is 14.56 kg , so AFR = 14.56.

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  9. Bose–Einstein statistics - Wikipedia

    en.wikipedia.org/wiki/Bose–Einstein_statistics

    The average particle number for that single-particle substate is given by = (), = ⁡ (() /) This result applies for each single-particle level and thus forms the Bose–Einstein distribution for the entire state of the system.