Keyboard graph navigation: press N for concepts or E for relations; use arrow keys, Home, and End to move; Enter selects; Shift plus Enter selects and centers; plus and minus zoom; zero fits; Escape clears the selection. Use the visible viewport buttons as alternatives to dragging, wheel, and pinch gestures.
Canonical static concept record
Open this concept in the interactive graphRead the Markdown equivalent
A probability measure over classical microstates or a density operator over a quantum state space, chosen to represent preparation constraints and calculate expectation values.
wp-physics-statistical-ensemblewp-physics-statistical-mechanicstong-statistical-physicsEach relation below ends at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
A classical statistical ensemble is formulated as a probability measure on a specified microstate space. Quantum ensembles instead use density operators, so the probability-distribution formulation is not the whole target concept.
A mathematical concept supplies part of the formal language, state space, representation, or analytic machinery used by a scientific or mathematical-physics concept. The source is the mathematical predecessor; this does not claim that physical content follows from mathematics alone.
wp-probability-distributionwp-physics-statistical-ensembletong-statistical-physicsThis is an authored directed relation from the source endpoint to the target endpoint.
An ensemble is the probabilistic state description used to average observables over classical or quantum microscopic alternatives.
The target represents a state, property, observable, or state-dependent description associated with the source system or theory.
wp-physics-statistical-ensemblewp-physics-statistical-mechanicstong-statistical-physicsEach relation below starts at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
The canonical ensemble is the equilibrium ensemble for energy exchange with a temperature reservoir at fixed remaining controls.
The target is a member or subtype of the broader source class.
wp-physics-canonical-ensemblewp-physics-statistical-ensembletong-statistical-physicsThis is an authored directed relation from the source endpoint to the target endpoint.
Gibbs entropy is a functional of the ensemble probabilities or density operator, with the reference measure and quantum trace specified.
The target represents a state, property, observable, or state-dependent description associated with the source system or theory.
wp-physics-gibbs-entropywp-physics-statistical-ensembletong-statistical-physicsThis is an authored directed relation from the source endpoint to the target endpoint.
The grand-canonical ensemble permits energy and particle exchange and weights states using temperature and chemical potential.
The target is a member or subtype of the broader source class.
wp-physics-grand-canonical-ensemblewp-physics-statistical-ensembletong-statistical-physicsThis is an authored directed relation from the source endpoint to the target endpoint.
The microcanonical ensemble is the equilibrium ensemble selected by isolation and fixed conserved quantities, including an energy shell.
The target is a member or subtype of the broader source class.
wp-physics-microcanonical-ensemblewp-physics-statistical-ensembletong-statistical-physics