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Thermodynamics studies heat, work, and temperature and their connections to energy and entropy, governed by four universal laws.
Thermodynamics is a branch of physics that studies heat, work, and temperature and how these quantities relate to energy, entropy, and the physical properties of matter and radiation. Its behavior is described quantitatively by the four laws of thermodynamics, which use measurable macroscopic variables, while microscopic explanations can be provided through statistical mechanics. The field is widely applied across science and engineering, including physical chemistry, biochemistry, chemical engineering, mechanical engineering, and even areas like meteorology. The scope of thermodynamics is organized around the analysis of thermodynamic systems and their surroundings. A system is a precisely defined region of the universe, and its properties are linked through equations of state; these properties can be combined to express internal energy and thermodynamic potentials, which help determine equilibrium conditions and spontaneous processes. Thermodynamics can model how systems respond to environmental changes and is used to study phenomena such as engines, phase transitions, chemical reactions, transport processes, and even black holes. The topic also distinguishes classical thermodynamics (mainly near-equilibrium systems) from extensions such as non-equilibrium thermodynamics and statistical thermodynamics, which connects macroscopic behavior to microscopic particle dynamics.
Thermodynamics studies heat, work, and temperature and their connections to energy and entropy, governed by four universal laws.
Its scope centers on thermodynamic systems and surroundings, using macroscopic measurable properties, equations of state, internal energy, and thermodynamic potentials to analyze equilibrium and spontaneous processes.
Thermodynamics applies broadly across science and engineering, with classical thermodynamics focused on near-equilibrium systems and statistical/non-equilibrium approaches extending the framework.
A precisely defined region of the universe under study, with everything outside it treated as the surroundings.
A thermodynamic quantity introduced by the second law that indicates the direction of evolution of a system and quantifies order and the maximum useful work extractable.
Quantitative measures of stored energy in a system that help determine energy changes and equilibrium under specific constraints (e.g., Helmholtz and Gibbs free energies).
The study of thermodynamic systems primarily in near-equilibrium conditions using macroscopic, measurable properties.
A branch of thermodynamics that analyzes systems not in thermodynamic equilibrium, requiring more general concepts than equilibrium thermodynamics.
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