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Thermodynamic process
thermodynamics, a quasi-static process, also known as a quasi-equilibrium process (from Latin quasi, meaning ‘as if’), is a thermodynamic process that happens slowly
Quasistatic_process
Passage of a system from an initial to a final state of thermodynamic equilibrium
to think of the "processes" described by the paths as fictively "reversible". Reversible processes are always quasistatic processes, but the converse
Thermodynamic_process
Process whose direction can be reversed
dissipation. To maintain equilibrium, reversible processes are extremely slow (quasistatic). The process must occur slowly enough that after some small
Reversible process (thermodynamics)
Reversible_process_(thermodynamics)
Series of activities
temperature stays constant Polytropic process, which obeys the equation p v n = C {\displaystyle pv^{\,n}=C} Quasistatic process, which occurs infinitely slowly
Process
Topics referred to by the same term
Quasistatic can refer to: Quasistatic process Quasistatic equilibrium Quasistatic loading Quasistatic approximation This disambiguation page lists articles
Quasistatic
Linked cyclic series of thermodynamic processes
Cycles composed entirely of quasistatic processes can operate as power or heat pump cycles by controlling the process direction. On a pressure–volume
Thermodynamic_cycle
Thermodynamic process in which no mass or heat is exchanged with surroundings
An adiabatic process (adiabatic from Ancient Greek ἀδιάβατος (adiábatos) 'impassable') is a type of thermodynamic process that occurs without transferring
Adiabatic_process
Thermodynamic process
Adiabatic process Compressor Internal combustion engine Isentropic process Isobaric process Isochoric process Isothermal process Polytrope Quasistatic equilibrium
Polytropic_process
Law of thermodynamics establishing the conservation of energy
heat and work added, with no restrictions as to whether the process is reversible, quasistatic, or irreversible.[title missing] This statement by Crawford
First_law_of_thermodynamics
Property of physical systems that stays somewhat constant through slow changes
closer to the thermodynamical concept of a quasistatic process and has no direct relation with adiabatic processes in thermodynamics. In mechanics, an adiabatic
Adiabatic_invariant
Thermodynamic process that is reversible and adiabatic
accepted that a process, compression or expansion, as desired, could be performed 'infinitely slowly'[,] or as is sometimes said, quasistatically." P. 130:
Isentropic_process
Thermodynamic process in which temperature remains constant
An isothermal process is a type of thermodynamic process in which the temperature T of a system remains constant: ΔT = 0. This typically occurs when a
Isothermal_process
Irreversible thermodynamic process in which a volume of gas expands into a vacuum
has been doubled. In the limit δV to zero, this becomes an ideal quasistatic process, albeit an irreversible one. Now, according to the fundamental thermodynamic
Joule_expansion
Concept in quantum mechanics
for fast process. The classical and quantum mechanics definition is instead closer to the thermodynamical concept of a quasistatic process, which are
Adiabatic_theorem
Process that cannot be undone or reversed
In thermodynamics, an irreversible process is a process impossible to reverse or undo. All complex natural processes are irreversible, although a phase
Irreversible_process
Thermodynamic process of a closed system in which volume remains constant
an isochoric process, also called a constant-volume process, an isovolumetric process, or an isometric process, is a thermodynamic process during which
Isochoric_process
Thermodynamic process with no change in enthalpy
An isenthalpic process or isoenthalpic process is a process that proceeds without any change in enthalpy, H; or specific enthalpy, h. If a steady-state
Isenthalpic_process
Equation in statistical mechanics
{\displaystyle \Delta F\leq W} , with equality holding only in the case of a quasistatic process, i.e. when one takes the system from A to B infinitely slowly (such
Jarzynski_equality
Relation between thermodynamic states
The original definition of Carathéodory was limited to reversible, quasistatic process, described by a curve in the manifold of equilibrium states of the
Adiabatic_accessibility
Pair of values which express a thermodynamic system's internal energy
connection is that of quasistatic processes, namely idealized, "infinitely slow" processes. Time-dependent thermodynamic processes far away from equilibrium
Conjugate variables (thermodynamics)
Conjugate_variables_(thermodynamics)
Thermodynamic process in which pressure remains constant
In thermodynamics, an isobaric process is a type of thermodynamic process in which the pressure of the system stays constant: ΔP = 0. The heat transferred
Isobaric_process
Force needed to pull a spring grows linearly with distance
can be approximated as adiabatic. Under these conditions and for quasistatic processes the first law of thermodynamics for a deformed body can be expressed
Hooke's_law
Thermodynamic quantity
path of a process through the equilibrium state space of a thermodynamic system is termed a process function, or, alternatively, a process quantity, or
Process_function
Thermodynamic quantity
gives the important relation for an isentropic (quasistatic, reversible, adiabatic process) process of a simple compressible calorically perfect ideal
Heat_capacity_ratio
Type of energy transfer
Likewise, with a well-defined pressure, P, behind a slowly moving (quasistatic) boundary, the work differential, δW, and the pressure, P, combine to
Heat
Distinctive narrow spectral feature of chemical species
described by a Lorentzian profile and there may be an associated shift. Quasistatic pressure broadening: The presence of other particles shifts the energy
Spectral_line
Physical law for entropy and heat
chemical composition and mass), d S = δ Q T (actually possible quasistatic irreversible process without composition change). {\displaystyle \mathrm {d} S={\frac
Second_law_of_thermodynamics
Equation of the state of a hypothetical ideal gas
thermodynamic processes are defined such that one of the gas properties (P, V, T, S, or H) is constant throughout the process. For a given thermodynamic process, in
Ideal_gas_law
Thermodynamic cycle for spark ignition piston engines
and isentropic processes (frictionless, adiabatic reversible). Left and right sides of the loop: a pair of parallel isochoric processes (constant volume)
Otto_cycle
Property of a thermodynamic system
\mathrm {d} S={\frac {\delta Q_{\mathsf {rev}}}{T}}} The reversible process is quasistatic (i.e., it occurs without any dissipation, deviating only infinitesimally
Entropy
Observational basis of thermodynamics
thermodynamic equilibrium. The laws also use various parameters for thermodynamic processes, such as thermodynamic work and heat, and establish relationships between
Laws_of_thermodynamics
Set of imaging methods for determining soft-tissue hardness
elastographic techniques. The most prominent are highlighted below. Quasistatic elastography (sometimes called simply 'elastography' for historical reasons)
Elastography
Chemical process in the liquefaction of gas
The Hampson–Linde cycle is a process for the liquefaction of gases, especially for air separation. William Hampson and Carl von Linde independently filed
Hampson–Linde_cycle
Body of matter in a state of internal equilibrium
thermodynamic process, one can assume that each intermediate state in the process is at equilibrium. Such a process is called quasistatic. For a process to be
Thermodynamic_system
Quasiprobability distribution Quasistability Quasistatic approximation Quasistatic equilibrium Quasistatic loading Quasistatic process Qubit Qubit field theory Quenched
Index_of_physics_articles_(Q)
Electronic current integrator
be easily processed. Some Guitar pickup amplifiers also use charge amplifiers. Advantages of charge amplifiers include: Enables quasistatic measurements
Charge_amplifier
would flow at that voltage, say I = I ( V ) {\displaystyle I=I(V)} (the quasistatic approximation). Suppose further that the time to cross the device is
Diffusion_capacitance
Physical quantity
constantly take in and release energy. The Earth's climate and ecosystems processes are driven primarily by radiant energy from the Sun. The total energy
Energy
Technique and process of creating visual representations of the interior of a body
ultrasound machines. Main branches of ultrasound elastography include Quasistatic Elastography/Strain Imaging, Shear Wave Elasticity Imaging (SWEI), Acoustic
Medical_imaging
Diagram showing the thermodynamic states of a material
this process due to the free floating piston being allowed to rise making the process an isobaric process or constant pressure process. This Process Path
Thermodynamic_diagrams
Graph relating temperature and entropy during a thermodynamic process or cycle
during a process. For reversible (ideal) processes, the area under the T–s curve of a process is the heat transferred to the system during that process. Working
Temperature–entropy_diagram
Model that is used to predict the performance of steam turbine systems
The Rankine cycle is an idealized thermodynamic cycle describing the process by which certain heat engines, such as steam turbines or reciprocating steam
Rankine_cycle
Thermodynamic cycle that includes the basic Stirling engine
heat-rejection processes is the Stirling cycle, which is an altered version of the Carnot cycle in which the two isentropic processes featured in the
Stirling_cycle
Physical property of matter
as the definition of the isobaric heat capacity. A system undergoing a process at constant volume implies that no expansion work is done, so the heat
Heat_capacity
Closed thermodynamic cycle involving fluid
heat injection process in the cycle. Along adiabatic and isentropic processes, such as those theoretically associated with pumping processes in transcritical
Transcritical_cycle
Engine combustion process
The Diesel cycle is a combustion process of a reciprocating internal combustion engine. In it, fuel is ignited by heat generated during the compression
Diesel_cycle
Type of thermodynamic cycle
Process 3 -> 4: Isothermal expansion. The power-cylinder expansion-space is heated externally, and the gas undergoes isothermal expansion. Process 4
Ericsson_cycle
Thermodynamic cycle
this occurs, all available energy has been obtained from the combustion process. For any given portion of air, the greater expansion ratio converts more
Atkinson_cycle
Thermodynamic potential
Helmholtz energy during a process is equal to the maximum amount of work that the system can perform in a thermodynamic process in which temperature is
Helmholtz_free_energy
Type of energy transfer
Thermodynamic work is one of the principal kinds of process by which a thermodynamic system can interact with and transfer energy to its surroundings
Work_(thermodynamics)
Idealized thermodynamic cycle
temperature is constant (isothermal process). Heat transfer from point 4 to 1 and point 2 to 3 are equal to zero (adiabatic process). A Carnot cycle plotted on
Carnot_cycle
Concept in general relativity and quantum field theory
Control volume Instruments Processes Isobaric Isochoric Isothermal Isothermal flow Adiabatic Isentropic Isenthalpic Quasistatic Polytropic Free expansion
Black_hole_thermodynamics
magnetic flux density. So the first law of thermodynamics in a reversible process can be expressed as Δ U = ∫ S T d S − ∫ V P d V + 1 4 π ∫ V H ⋅ Δ B d V
Magnetic Thermodynamic Systems
Magnetic_Thermodynamic_Systems
Initial step in the phase transition or molecular self-assembly of a substance
within a substance or mixture. Nucleation is typically defined as the process that determines how long an observer must wait before a new phase or self-organised
Nucleation
Unsteady state combustion process
Pressure gain combustion (PGC) is the unsteady state process used in gas turbines in which gas expansion caused by heat release is constrained. First
Pressure_gain_combustion
Thermodynamic cycle
Control volume Instruments Processes Isobaric Isochoric Isothermal Isothermal flow Adiabatic Isentropic Isenthalpic Quasistatic Polytropic Free expansion
Miller_cycle
Maximum attainable efficiency of any heat engine
b} in a V-T (Volume-Temperature) space, is the same over all reversible process paths between these two states. If this integral were not path independent
Carnot's theorem (thermodynamics)
Carnot's_theorem_(thermodynamics)
Numerical technique for bioelectromagnetic modeling
a dimensionality reduction numerical technique that is used to model quasistatic electromagnetic phenomena in highly complex conducting media (targeting
Charge based boundary element fast multipole method
Charge_based_boundary_element_fast_multipole_method
Control volume Instruments Processes Isobaric Isochoric Isothermal Isothermal flow Adiabatic Isentropic Isenthalpic Quasistatic Polytropic Free expansion
Internal_pressure
Quantifiable conditions of a thermodynamic system at a specific time
a thermodynamic process; usually this is transfer of matter or energy between system and surroundings. In any thermodynamic process, whatever may be
Thermodynamic_state
State function whose change relates to the system's maximal work output
work that the system can perform in a process at constant temperature, and its sign indicates whether the process is thermodynamically favorable or forbidden
Thermodynamic_free_energy
Thermodynamic cycle for combustion engines
of heat at constant volume. Process 3-4: Addition of heat at constant pressure. Process 4-5: Isentropic expansion. Process 5-1: Rejection of heat at constant
Mixed/dual_cycle
State of thermodynamic systems where no net flow of matter or energy occurs
natural process proceeds at a finite rate for the main part of its course. It is thereby radically different from a fictive quasi-static 'process' that
Thermodynamic_equilibrium
Performance measure of a device that uses thermal energy
by the second law of thermodynamics it cannot be equal in a non-ideal process, so 0 ≤ η t h < 1 {\displaystyle 0\leq \eta _{\rm {th}}<1} When expressed
Thermal_efficiency
Force distributed over an area
Control volume Instruments Processes Isobaric Isochoric Isothermal Isothermal flow Adiabatic Isentropic Isenthalpic Quasistatic Polytropic Free expansion
Pressure
Thermodynamic cycle
Ernest. L. Baker and Leonard I.Stiel. Optimu, Performance of explosives in a quasistatic detonation cycle. NYU Polytechnic School of Engineering. 2017.
Fickett–Jacobs_cycle
thermodynamics, entropy is a numerical quantity that shows that many physical processes can go in only one direction in time. For example, cream and coffee can
Introduction_to_entropy
Physics of heat, work, and temperature
are: Adiabatic process: occurs without loss or gain of energy by heat Isenthalpic process: occurs at a constant enthalpy Isentropic process: a reversible
Thermodynamics
Volume of fluid which passes per unit time
Control volume Instruments Processes Isobaric Isochoric Isothermal Isothermal flow Adiabatic Isentropic Isenthalpic Quasistatic Polytropic Free expansion
Volumetric_flow_rate
useful devices since the 17th century as a better understanding of the processes involved was gained. A heat engine is any system that converts heat to
Timeline of heat engine technology
Timeline_of_heat_engine_technology
Separation of electric charge due to presence of other charges
Electrostatic induction laws apply in dynamic situations as far as the quasistatic approximation is valid. The phenomenon of induction was well-known before
Electrostatic_induction
Version of the second law of thermodynamics
instant in time. The closed integral is carried out along a thermodynamic process path from the initial/final state to the same initial/final state (thermodynamic
Clausius_theorem
Mathematical model which approximates the behavior of real gases
in a throttling process the temperature of the gas does not change. (If the pressure of a real gas is reduced in a throttling process, its temperature
Ideal_gas
Thermodynamic cycle
into the gas turbine's combustion chamber to increase power output. The process can be thought of as a parallel combination of the gas-turbine Brayton
Cheng_cycle
Chemical law
Control volume Instruments Processes Isobaric Isochoric Isothermal Isothermal flow Adiabatic Isentropic Isenthalpic Quasistatic Polytropic Free expansion
Piobert's_law
Function describing equilibrium states of a system
expressed by exact differentials. In contrast, mechanical work and heat are process quantities or path functions because their values depend on a specific
State_function
following series of thermodynamic processes: A-B and C-D (TOP and BOTTOM of the loop): a pair of quasi-parallel adiabatic processes D-A (LEFT side of the loop):
Scuderi_cycle
Model of fluid flow
has applicability as upper boundary to Fanno flow. Fanno flow Isentropic process Rayleigh flow Shapiro, A.H., The Dynamics and Thermodynamics of Compressible
Isothermal_flow
Control volume Instruments Processes Isobaric Isochoric Isothermal Isothermal flow Adiabatic Isentropic Isenthalpic Quasistatic Polytropic Free expansion
High-efficiency_hybrid_cycle
Properties independent of system size, and proportional to system size
not conserved in a thermodynamic process of transfer between a system and its surroundings. In a thermodynamic process in which a quantity of energy is
Intensive and extensive properties
Intensive_and_extensive_properties
Parameter used to calculate the volume change of a fluid or solid in response to pressure
system the magnitude of the compressibility depends strongly on whether the process is isentropic or isothermal. Accordingly, isothermal compressibility is
Compressibility
Branch of thermodynamics
equilibrium. Non-equilibrium thermodynamics is concerned with transport processes and with the rates of chemical reactions. Almost all systems found in
Non-equilibrium thermodynamics
Non-equilibrium_thermodynamics
Physical law for definition of temperature
the labeling may be quite arbitrary, temperature is just such a labeling process which uses the real number system for tagging. The zeroth law justifies
Zeroth_law_of_thermodynamics
System that converts heat or thermal energy to mechanical work
the colder sink until it reaches a lower temperature state. During this process some of the thermal energy is converted into work by exploiting the properties
Heat_engine
Maximum stress withstood by stretched material before breaking
January 2009. Retrieved 23 January 2009. Blackledge; et al. (2005). "Quasistatic and continuous dynamic characterization of the mechanical properties
Ultimate_tensile_strength
Rate of change of acceleration with time
the change in acceleration. The distorted body acts as if it were in a quasistatic regime, and only a changing force (nonzero jerk) can cause propagation
Jerk_(physics)
Variation on the Rankine thermodynamic cycle
model, the expansion is isentropic and the evaporation and condensation processes are isobaric. In any real cycle, the presence of irreversibilities lowers
Organic_Rankine_cycle
Mass fraction of a saturated mixture which is vapor
Control volume Instruments Processes Isobaric Isochoric Isothermal Isothermal flow Adiabatic Isentropic Isenthalpic Quasistatic Polytropic Free expansion
Vapor_quality
output in the valveless Stirling engine. The generalized thermodynamic processes of the 1919 Stoddard cycle are: Adiabatic compression Isobaric heat-addition
Stoddard_engine
Partition equilibrium, a type of chromatography that is typically used in GC Quasistatic equilibrium, the quasi-balanced state of a thermodynamic system near
List_of_types_of_equilibrium
Thermodynamic cycle
compressor. isobaric process – heat rejection (in the atmosphere). Actual Brayton cycle: adiabatic process – compression isobaric process – heat addition adiabatic
Brayton_cycle
Quantum physics-based metaheuristic for optimization problems
PMID 24948715. Amin, Mohammad H. (2015). "Searching for quantum speedup in quasistatic quantum annealers". Physical Review A. 92 (5) 052323. arXiv:1503.04216
Quantum_annealing
Scalar physical quantities representing system states
equality holds for reversible processes. This leads to the standard differential form of the internal energy in case of a quasistatic reversible change: d U
Thermodynamic_potential
Subset of irreversible thermodynamics
standard Carnot result, but it requires heat transfer to be reversible (quasistatic), thus taking infinite time. At maximum power output, its efficiency
Endoreversible_thermodynamics
Measure of energy in a thermodynamic system
For endothermic (heat-absorbing) processes, the change ΔH is a positive value; for exothermic (heat-releasing) processes it is negative. The enthalpy of
Enthalpy
Diagram showing the relationship between pressure and volume in a system
pressure P with respect to volume V for some process or processes. Commonly in thermodynamics, the set of processes forms a cycle, so that upon completion of
Pressure–volume_diagram
Refrigerator that uses a heat source
that uses a heat source to provide the energy needed to drive the cooling process. Solar energy, burning oil, waste heat from factories, and district heating
Absorption_refrigerator
Relations between flows and forces, or gradients, in thermodynamic systems
collected and analyzed by D. G. Miller for many classes of irreversible processes, namely for thermoelectricity, electrokinetics, transference in electrolytic
Onsager_reciprocal_relations
Absorption refrigerator invented in 1930
Control volume Instruments Processes Isobaric Isochoric Isothermal Isothermal flow Adiabatic Isentropic Isenthalpic Quasistatic Polytropic Free expansion
Einstein_refrigerator
Physical quantity of hot and cold
engineering and geography as well as most aspects of daily life. Many physical processes are related to temperature; some of them are given below: the physical
Temperature
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