Correction factor which describes the deviation of a real gas from ideal gas behavior
Thermodynamics
The classical Carnot heat engine
Branches
Classical
Statistical
Chemical
Quantum thermodynamics
Equilibrium / Non-equilibrium
Laws
Zeroth
First
Second
Third
Systems
Closed system
Open system
Isolated system
State
Equation of state
Ideal gas
Real gas
State of matter
Phase (matter)
Equilibrium
Control volume
Instruments
Processes
Isobaric
Isochoric
Isothermal
Adiabatic
Isentropic
Isenthalpic
Quasistatic
Polytropic
Free expansion
Reversibility
Irreversibility
Endoreversibility
Cycles
Heat engines
Heat pumps
Thermal efficiency
System properties
Note: Conjugate variables in italics
Property diagrams
Intensive and extensive properties
Process functions
Work
Heat
Functions of state
Temperature / Entropy (introduction)
Pressure / Volume
Chemical potential / Particle number
Vapor quality
Reduced properties
Material properties
Property databases
Specific heat capacity
Compressibility
Thermal expansion
Equations
Carnot's theorem
Clausius theorem
Fundamental relation
Ideal gas law
Maxwell relations
Onsager reciprocal relations
Bridgman's equations
Table of thermodynamic equations
Potentials
Free energy
Free entropy
Internal energy
Enthalpy
Helmholtz free energy
Gibbs free energy
History
Culture
History
General
Entropy
Gas laws
"Perpetual motion" machines
Philosophy
Entropy and time
Entropy and life
Brownian ratchet
Maxwell's demon
Heat death paradox
Loschmidt's paradox
Synergetics
Theories
Caloric theory
Vis viva("living force")
Mechanical equivalent of heat
Motive power
Key publications
An Experimental Enquiry Concerning ... Heat
On the Equilibrium of Heterogeneous Substances
Reflections on the Motive Power of Fire
Timelines
Thermodynamics
Heat engines
Art
Education
Maxwell's thermodynamic surface
Entropy as energy dispersal
Scientists
Bernoulli
Boltzmann
Bridgman
Carathéodory
Carnot
Clapeyron
Clausius
de Donder
Duhem
Gibbs
von Helmholtz
Joule
Kelvin
Lewis
Massieu
Maxwell
von Mayer
Nernst
Onsager
Planck
Rankine
Smeaton
Stahl
Tait
Thompson
van der Waals
Waterston
Other
Nucleation
Self-assembly
Self-organization
Order and disorder
Category
v
t
e
In thermodynamics, the compressibility factor (Z), also known as the compression factor or the gas deviation factor, describes the deviation of a real gas from ideal gas behaviour. It is simply defined as the ratio of the molar volume of a gas to the molar volume of an ideal gas at the same temperature and pressure. It is a useful thermodynamic property for modifying the ideal gas law to account for the real gas behaviour.[1] In general, deviation from ideal behaviour becomes more significant the closer a gas is to a phase change, the lower the temperature or the larger the pressure. Compressibility factor values are usually obtained by calculation from equations of state (EOS), such as the virial equation which take compound-specific empirical constants as input. For a gas that is a mixture of two or more pure gases (air or natural gas, for example), the gas composition must be known before compressibility can be calculated.
Alternatively, the compressibility factor for specific gases can be read from generalized compressibility charts[1] that plot as a function of pressure at constant temperature.
The compressibility factor should not be confused with the compressibility (also known as coefficient of compressibility or isothermal compressibility) of a material, which is the measure of the relative volume change of a fluid or solid in response to a pressure change.
^ abProperties of Natural Gases Archived 2011-02-06 at the Wayback Machine. Includes a chart of compressibility factors versus reduced pressure and reduced temperature (on last page of the PDF document)
and 25 Related for: Compressibility factor information
before compressibility can be calculated. Alternatively, the compressibilityfactor for specific gases can be read from generalized compressibility charts...
reduced temperature and reduced pressure, have approximately the same compressibilityfactor and all deviate from ideal gas behavior to about the same degree...
state, that depend on a molecular parameter such as the critical compressibilityfactor, Z c = p c v c / ( R T c ) {\displaystyle Z_{\text{c}}=p_{\text...
assumption that the compressibilityfactor Z is set to 1 meaning that this pneumatic ratio remains constant. A compressibilityfactor of one also requires...
gas behavior can be described by a dimensionless quantity, the compressibilityfactor, Z. The ideal gas model has been explored in both the Newtonian...
a data set in statistics where the Standard score is zero 0Z, a Compressibilityfactor or zero Z0 (disambiguation) This disambiguation page lists articles...
acentric factor. The model should provide reasonable accuracy near the critical point, particularly for calculations of the compressibilityfactor and liquid...
and p n {\displaystyle p_{n}} = 1.01 bar (14.72 psia) and a unity compressibilityfactor Z n {\displaystyle Z_{n}} = 1 (i.e., an ideal gas is used for the...
of the density. This equation may be represented in terms of the compressibilityfactor, Z {\displaystyle Z} , as Z ≡ P R T ρ = A + B ρ + C ρ 2 + ⋯ {\displaystyle...
gasses (most gasses) a compressibilityfactor "Z" is introduced to allow for non-ideality. To introduce the compressibilityfactor to the equation divide...
Products & Chemicals Air separation The BOC Group Chemical engineer Compressibilityfactor Fischer–Tropsch process Gas separation Gas to liquids Hampson–Linde...
usual cases. The deviation from ideality can be described by the compressibilityfactor Z. Real gases are often modeled by taking into account their molar...
Y {\displaystyle Y} admittance siemens (S) Z {\displaystyle Z} compressibilityfactor unitless electrical impedance ohm (Ω) Z 0 {\displaystyle Z_{0}}...
the Mach speed. Mach incorporates the above data including the compressibilityfactor. Modern aircraft instrumentation use an air data computer to perform...
: 251–252 The integral can be recast in an alternative form using the compressibilityfactor Z = P V m R T . {\displaystyle Z={\frac {PV_{\mathrm {m} }}{RT}}...
capacity ratio (γ) at 30 °C (86 °F) 1.178253 Compressibilityfactor (Z) at 15 °C 0.9831 Acentric factor (ω) 0.22082 Molecular dipole moment 1.458 D Viscosity...
dimensionless thermodynamic coordinates, taken together with a substance's compressibilityfactor, provide the basis for the simplest form of the theorem of corresponding...
Compressible flow (or gas dynamics) is the branch of fluid mechanics that deals with flows having significant changes in fluid density. While all flows...
temperature (°F)] / [459.67 + line temperature (°F)] Fpv: super compressibilityfactor (often omitted or shown as equaling 1) Example: How many standard...
intermolecular forces and compressibility effects come into play. A measure of the fluid non-ideality is given by the compressibilityfactor Z{\displaystyle Z}...
P}}=0\qquad {\mbox{if}}~P\to 0} where Z {\displaystyle Z} is the compressibilityfactor. Expanding the van der Waals equation in 1 V m {\textstyle {\frac...
interaction is more important depends on temperature and pressure (see compressibilityfactor). In a gas, the distances between molecules are generally large...
Global Information
