Physics › Thermodynamics
Mathematical transformation in physics
Time-translation symmetry or temporal translation symmetry (TTS) is a mathematical transformation in physics that moves the times of events through a common interval. Time-translation symmetry is the law that the laws of physics are unchanged (i.e. invariant) under such a transformation.
Physics › Thermodynamics
Interpretation of entropy as the change in arrangement of a system's particles
In thermodynamics, entropy is often associated with the amount of order or disorder in a thermodynamic system.
Physics › Thermodynamics
Theorem in classical statistical mechanics
In classical statistical mechanics, the equipartition theorem relates the temperature of a system to its average energies. The equipartition theorem is also known as the law of equipartition, equipartition of energy, or simply equipartition.
Physics › Thermodynamics
State of matter of many bosons
An ideal Bose gas is a quantum-mechanical phase of matter, analogous to a classical ideal gas. It is composed of bosons, which have an integer value of spin and abide by Bose–Einstein statistics.
Physics › Thermodynamics
Management strategy for global warming
Passive daytime radiative cooling (PDRC)—also called passive radiative cooling, daytime passive radiative cooling, radiative sky cooling, photonic radiative cooling, and terrestrial radiative cooling—is the use of surfaces that are highly reflective and have high thermal emissivity to reduce the temperature of a building or other object.
Physics › Thermodynamics
Interpretation of entropy as a measure of the spread of energy
In thermodynamics, the interpretation of entropy as a measure of energy dispersal has been exercised against the background of the traditional view, introduced by Ludwig Boltzmann, of entropy as a quantitative measure of disorder. The energy dispersal approach avoids the ambiguous term 'disorder'.
Physics › Thermodynamics
State of thermodynamic systems where no net flow of matter or energy occurs
Thermodynamic equilibrium is a notion of thermodynamics with axiomatic status referring to an internal state of a single thermodynamic system, or a relation between several thermodynamic systems connected by more or less permeable or impermeable walls.
Physics › Thermodynamics
Scalar physical quantities representing system states
A thermodynamic potential (or more accurately, a thermodynamic potential energy) is a scalar quantity used to represent the thermodynamic state of a system.
Physics › Thermodynamics
Physical force that originates from thermodynamics instead of fundamental interactions
In physics, an entropic force acting in a system is an emergent phenomenon resulting from the entire system's statistical tendency to increase its entropy, rather than from a particular underlying force on the atomic scale.
Physics › Thermodynamics
Equations definiting head capacities in thermodynamics
In thermodynamics, the heat capacity at constant volume, CV, and the heat capacity at constant pressure, CP, are extensive properties that have the magnitude of energy divided by temperature.
Physics › Thermodynamics
Thermal method of analysis
Thermogravimetric analysis or thermal gravimetric analysis (TGA) is a method of thermal analysis in which the mass of a sample is measured over time as the temperature changes.
Physics › Thermodynamics
Fluid flow through a narrow opening with no change in entropy
In fluid mechanics, isentropic nozzle flow describes the movement of a fluid through a narrow opening without an increase in entropy (an isentropic process).
