Thermal energy

Thermal energy is energy associated with the random motion and interactions of particles in a substance. It contributes to a system’s internal energy and is related to, but distinct from, temperature.

Kinetic theory of gases: A model that explains gas properties through the motion and collisions of microscopic particles. It connects molecular motion to measurable thermal behavior.
Statistical mechanics: The framework that derives macroscopic physical behavior from the statistical properties of microscopic states. It links particle-level energy distributions to bulk thermal properties.
Calorimetry: The measurement of heat exchanged in physical or chemical processes. Calorimeters infer energy changes from controlled thermal exchanges.
Thermodynamic temperature: An absolute temperature defined by thermodynamic principles and measured in kelvins. Unlike thermal energy, temperature is an intensive state variable.
Temperature: A physical quantity that characterizes how hot or cold a system is and sets the direction of spontaneous heat transfer. Temperature tracks average particle energy, not the system’s total thermal energy.
Boltzmann constant: A physical constant that relates temperature to energy at the scale of individual particles. It sets the energy scale corresponding to a given temperature.
Thermal conductivity: A material property describing how readily heat flows through a substance. It governs how quickly thermal energy spreads through materials.
Mechanical energy: Energy associated with an object’s organized motion and position in a force field. Its macroscopic, organized motion contrasts with microscopic random motion.
Internal energy: The total microscopic kinetic and potential energy contained within a system. Thermal energy is commonly treated as a contribution to this broader energy account.
Heat capacity: The amount of energy a system must gain to raise its temperature by a specified amount. It measures how strongly added energy changes a substance’s temperature.

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