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Results for “Entropy”

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Thermodynamics & Statistical Physics

Entropy

A fundamental thermodynamic property measuring the degree of microscopic disorder, randomness, or thermal energy unavailable for mechanical…

dS = dQ_rev / T, S = kB ln Ω J/K
Biophysics & Medical Physics

Entropy in Biological Systems

The thermodynamic concept describing how open biological systems maintain high internal structural order by expelling heat and entropy to…

dS_system + dS_environment ≥ 0 (Schrödinger: 'Living on Negative Entropy') J/K (Entropy)
Thermodynamics & Statistical Physics

Second Law of Thermodynamics

The law asserting that spontaneous physical processes increase total entropy in isolated systems, placing fundamental limits on heat engine…

ΔS_total ≥ 0 J/K
Condensed Matter & Materials Physics

Superfluidity

A macroscopic quantum state of matter where a fluid flows with exactly zero viscosity and zero kinetic entropy.

Viscosity η = 0 (Below Lambda point T_λ = 2.17 K) K (Lambda Transition Temperature)
Thermodynamics & Statistical Physics

Third Law of Thermodynamics

The law stating that as system temperature approaches absolute zero (0 K), entropy of a pure crystalline substance approaches a minimum…

lim (T → 0) S = 0 J/K
Foundations of Physics

Boltzmann Constant

The fundamental constant that converts thermodynamic temperature into microstate kinetic energy per particle.

k = R / Na = 1.380649 × 10⁻²³ J/K J/K
Thermodynamics & Statistical Physics

Maxwell Relations

A set of thermodynamic equations derived from equality of second partial derivatives of thermodynamic potentials (U, H, F, G).

(∂T/∂V)_S = -(∂P/∂S)_V, (∂T/∂P)_S = (∂V/∂S)_P, etc. Various
Thermodynamics & Statistical Physics

Partition Function

The central mathematical function in statistical mechanics that encodes statistical properties of a system in thermodynamic equilibrium.

Z = ∑ exp(-E_i / (kB T)) = ∑ g_i exp(-E_i / (kB T)) Dimensionless
Biophysics & Medical Physics

Protein Folding

The physical process by which a polypeptide chain folds spontaneously into a characteristic 3D functional native structure.

Energy Funnel Concept: Minimizing Native State Free Energy G kJ/mol (Conformational Stability)