statistical mechanics: meaning, definition, pronunciation and examples

Thermodynamics is a macroscopic theory describing relationships between properties like heat, work, and temperature without reference to atoms. Statistical mechanics provides the underlying microscopic foundation for thermodynamics, explaining why those relationships hold.

For 'classical statistical mechanics', no; it applies to systems obeying Newtonian physics. For 'quantum statistical mechanics', which describes systems like electrons in metals or liquid helium, a knowledge of quantum mechanics is essential.

While born in physics, its principles for dealing with large, complex systems have been applied in other fields like economics (e.g., modelling markets), computer science (e.g., simulated annealing algorithms), and biology (e.g., protein folding).

The partition function is a central mathematical function in statistical mechanics. It is a sum over all possible states of a system and contains all the thermodynamic information about that system; properties like energy and entropy can be derived from it.

A branch of physics that explains the macroscopic properties of matter (like temperature and pressure) by applying statistical methods to the motions and interactions of its microscopic particles.

Statistical mechanics is usually formal, academic, technical in register.

Statistical mechanics: in British English it is pronounced /stəˌtɪstɪk(ə)l mɪˈkænɪks/, and in American English it is pronounced /stəˌtɪstɪkəl məˈkænɪks/. Tap the audio buttons above to hear it.