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Rate at which heat spreads throughout a material
In thermodynamics, thermal diffusivity is the thermal conductivity divided by density and specific heat capacity at constant pressure. It is a measure
Thermal_diffusivity
Ratio of kinematic viscosity to thermal diffusivity
and the thermal boundary layer. For small values of the Prandtl number, Pr < 1, the thermal diffusivity is larger than the momentum diffusivity, and the
Prandtl_number
Ability of a material to exchange energy with surroundings
) or as the ratio of thermal conductivity to the square root of thermal diffusivity ( α {\displaystyle \alpha } ). e = λ α = λ ρ c p . {\displaystyle
Thermal_effusivity
Index of articles associated with the same name
different mediums. Diffusivity may refer to: Thermal diffusivity, diffusivity of heat Diffusivity of mass: Mass diffusivity, molecular diffusivity (often called
Diffusivity
Method of measuring thermal diffusivity of a material
The laser flash analysis or laser flash method is used to measure thermal diffusivity of a variety of different materials. An energy pulse heats one side
Laser_flash_analysis
Measurement of capacity of a material to conduct heat
thermal transport properties of the material. By recording temperature vs. time response in the sensor, the thermal conductivity, thermal diffusivity
Thermal conductivity measurement
Thermal_conductivity_measurement
Partial differential equation describing the evolution of temperature in a region
which α {\displaystyle \alpha } is a positive coefficient called the thermal diffusivity of the medium. In addition to other physical phenomena, this equation
Heat_equation
Dimensionless quantity related to transient heat conduction
used in the study of mass diffusion, in which the thermal diffusivity is replaced by the mass diffusivity. The Fourier number is used in analysis of time-dependent
Fourier_number
Ratio of thermal diffusivity to mass diffusivity
Le) is a dimensionless number defined as the ratio of thermal diffusivity to mass diffusivity. It is used to characterize fluid flows where there is
Lewis_number
Capacity of a material to conduct heat
contact conductance Thermal diffusivity Thermal diode Thermal effusivity Thermal entrance length Thermal interface material Thermal resistance Thermistor Thermocouple
Thermal conductivity and resistivity
Thermal_conductivity_and_resistivity
Dimensionless quantity associated with free convection of a fluid
(Pr), which describes the relationship between momentum diffusivity and thermal diffusivity: Ra = Gr × Pr. Hence it may also be viewed as the ratio of
Rayleigh_number
\Omega }}}} [citation needed] where α {\displaystyle \alpha } is the thermal diffusivity of the material (m2s−1), Ω {\displaystyle \Omega } is the external
Thermal_lag
Energy transfer influence
main soil thermal properties are Volumetric heat capacity, SI Units: J∙m−3∙K−1 Thermal conductivity, SI Units: W∙m−1∙K−1 Thermal diffusivity, SI Units:
Soil_thermal_properties
Ratio of a fluid's kinematic viscosity to mass diffusivity
dimensionless number defined as the ratio of momentum diffusivity (kinematic viscosity) and mass diffusivity, and it is used to characterize fluid flows in which
Schmidt_number
Analysis of material by examining response to heat
calorimetry Isothermal microcalorimetry Laser flash analysis: thermal diffusivity and thermal conductivity Thermogravimetric analysis: mass change versus
Thermal_analysis
(insulation) Thermal transmittance Specific heat capacity Thermal conductivity Thermal conductivities of the elements (data page) Thermal diffusivity Thermodynamics
List of thermal conductivities
List_of_thermal_conductivities
Thermal conducitivity measurement technique
temperature oscillations thus produced are then measured. The thermal conductivity and thermal diffusivity of the sample can be determined from their frequency
3ω-method
Property of a combustible mixture
is dependent on only three properties of a chemical mixture: the thermal diffusivity of the mixture, the reaction rate of the mixture and the temperature
Laminar_flame_speed
Properties of a thermal boundary layer
track the thickness and shape of that portion of the thermal boundary layer where thermal diffusivity α {\displaystyle {\alpha }} is significant. Hence the
Thermal boundary layer thickness and shape
Thermal_boundary_layer_thickness_and_shape
Term in geology
h(t)} : κ ∼ 8 ⋅ 10 − 7 m 2 ⋅ s − 1 for the thermal diffusivity α ∼ 4 ⋅ 10 − 5 ∘ C − 1 for the thermal expansion coefficient T 1 ∼ 1220 ∘ C for the
Seafloor_depth_versus_age
Process by which heat is transferred within an object
that has been adapted for practical use in the form of thermal spraying. The thermal diffusivity coefficient, represented as α {\displaystyle \alpha }
Thermal_conduction
Flat, horizontal concrete element of modern buildings
also related to thermal diffusivity, heat capacity and insulation. Concrete has low thermal diffusivity, high heat capacity, and its thermal mass is negatively
Concrete_slab
Synthetic polymer
surface to allow adhesion to other materials. Because of its chemical and thermal properties, PTFE is often used as a gasket material within industries that
Polytetrafluoroethylene
Layer of fluid in the immediate vicinity of a bounding surface
by mass diffusivity D A B {\displaystyle D_{AB}} in the mass balance. In thermal diffusivity of a substance, k {\displaystyle k} is its thermal conductivity
Boundary_layer
Combustion that leads on to an explosion
_{d}\simeq \delta ^{2}/\kappa ,} where κ {\displaystyle \kappa \;} is the thermal diffusivity. The second is the burning timescale τ b {\displaystyle \tau _{b}}
Deflagration
Method for matching variable production with demand
high thermal diffusivity compared to the speed of compression. Typically these compressors can run at speeds up to 1000 rpm. To ensure high thermal diffusivity
Compressed-air_energy_storage
Symbols for constants, special functions
(He2+) angular acceleration in physics the linear thermal expansion coefficient the thermal diffusivity In organic chemistry the α-carbon is the backbone
Greek letters used in mathematics, science, and engineering
Greek_letters_used_in_mathematics,_science,_and_engineering
Geological process at mid-ocean ridges
^{2}T}{\partial ^{2}x'}}} where κ {\displaystyle \kappa } is the thermal diffusivity of the mantle lithosphere. Since T depends on x' and t only through
Seafloor_spreading
term defined as the ratio between the momentum eddy diffusivity and the heat transfer eddy diffusivity. It is useful for solving the heat transfer problem
Turbulent_Prandtl_number
Material fuelling nuclear reactors
calculate and determine the thermal conductivity. λ = ρCpα λ thermal conductivity ρ density Cp heat capacity α thermal diffusivity If t1/2 is defined as the
Nuclear_fuel
Proportionality constant in some physical laws
Diffusivity, mass diffusivity or diffusion coefficient is usually written as the proportionality constant between the molar flux due to molecular diffusion
Mass_diffusivity
Fluid flow that occurs due to heterogeneous fluid properties and body forces
above, the equation is modified for thermal expansion and thermal diffusivity. Density variations due to thermal expansion are given by: Δ ρ = ρ 0 β Δ
Convection
Ratio of a fluid's advective and diffusive transport rates
Prandtl number, and α the thermal diffusivity, α = k ρ c p , {\displaystyle \alpha ={\frac {k}{\rho c_{p}}},} where k is the thermal conductivity, ρ the density
Péclet_number
Outermost shell of a terrestrial-type planet or natural satellite
the oceanic mantle lithosphere, κ {\displaystyle \kappa } is the thermal diffusivity (approximately 1.0×10−6 m2/s or 6.5×10−4 sq ft/min) for silicate
Lithosphere
Building material of earth and organic materials
Using the average value of the thermal conductivity as k = 32 Btu/(hr ft °F) or 0.55 W/(m K), the thermal diffusivity is calculated to be 0.013 sq ft/h
Adobe
of vaporization Inversion temperature Melting point Thermal conductivity Thermal diffusivity Thermal expansion Triple point Vapor pressure Specific heat
List_of_materials_properties
Chemical element with atomic number 47 (Ag)
lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity and reflectivity of any metal. Silver is found in the Earth's
Silver
Instrinsic flame instability
Diffusive–thermal instability or thermo–diffusive instability is an intrinsic flame instability that occurs both in premixed flames and in diffusion flames
Diffusive–thermal_instability
Dimensionless parameter in fluid mechanics
to viscous drag) and the total heat transfer at the wall (due to thermal diffusivity). Using the heat-mass transfer analogy, a mass transfer St equivalent
Stanton_number
Carbon-oxygen gas
supercritical carbon dioxide. Table of thermal and physical properties of saturated liquid carbon dioxide: Table of thermal and physical properties of carbon
Carbon_dioxide
Chemical compound
Stelmasiak, E. (January 1983). "Change in thermal properties of wool after treatment with liquid ammonia". Journal of Thermal Analysis. 26 (1): 17–22. doi:10.1007/BF01914084
Ammonia
Thermal engineering discipline concerning transfer of heat in physical systems
and upper ends, μ is the dynamic viscosity, α is the Thermal diffusivity, β is the volume thermal expansivity (sometimes denoted α elsewhere), T is the
Heat_transfer
Graphs for analyzing 1–D conductive heat transfer
location in the plane wall, λ is the root of λ * tan λ = Bi, and α is thermal diffusivity. The position x = 0 represents the center of the slab. The first
Heisler_chart
Finite difference method for numerically solving parabolic differential equations
if the ratio of time step Δ t {\displaystyle \Delta t} times the thermal diffusivity to the square of space step, Δ x 2 {\displaystyle \Delta x^{2}}
Crank–Nicolson_method
Family of polymers
polycarbonate is tougher and will hold up longer to extreme temperature. Thermally processed material is usually totally amorphous, and as a result is highly
Polycarbonate
Topics referred to by the same term
energy (A) Pre-exponential factor (A) Richardson's constant (A) Thermal diffusivity (a) Acceleration (a) Adsorption (a) Annum (a), for year Are (a),
A_(disambiguation)
Liquid hydrocarbon mixture condensed from natural gas
Ying Zhang, Mao-Gang He, Xiong Zheng, and Li-Bin Chen (2014): "Thermal Diffusivity and Speed of Sound of Saturated Pentane from Light Scattering". International
Natural_gasoline
Intrinsic instability in flames
diffusion coefficient and thermal diffusivity differ from each other significantly, leading to the so-called (Turing) diffusive-thermal instability. The full
Darrieus–Landau_instability
Region of base material which is altered (but not melted) during heat welding
heat input by the welding process. The thermal diffusivity of the base material plays a large role—if the diffusivity is high, the material cooling rate is
Heat-affected_zone
Combination of the diffusion and convection (advection) equations
transfer), D is the diffusivity (also called diffusion coefficient), such as mass diffusivity for particle motion or thermal diffusivity for heat transport
Convection–diffusion_equation
Traits of plants and animals
plants will be increased. Heat resistance is a function of bark thermal diffusivity (a property of the species) and bark thickness (increasing exponentially
Fire_adaptations
Topics referred to by the same term
Français d'Amman Laser flash analysis, a technique for measurement of thermal diffusivity Lateral flow assay, the principle behind immunochromatographic rapid
LFA
Polygonal stone columns
{\displaystyle Pe={\frac {Lv}{D}}} where D {\displaystyle D} is the thermal diffusivity of the material. For all columnar jointing, the value of Pe is around
Columnar_jointing
Body of intrusive igneous rocks
T_{0}} is the initial temperature of the hot material, k is the thermal diffusivity (typically close to 10−6 m2 s−1 for most geologic materials), x is
Igneous_intrusion
Fabrication process for joining materials
be of varying size and strength. The thermal diffusivity of the base material plays a large role—if the diffusivity is high, the material cooling rate is
Welding
Lab technique for measuring thermal properties through analyzing reflective properties
{\displaystyle q^{2}=(iw/d)} . Here, Λ is the thermal conductivity of the solid, D is the thermal diffusivity of the solid, and r is the radial coordinate
Time-domain_thermoreflectance
Mechanism by which a celestial body generates a magnetic field
k / ρ c p {\displaystyle \;\kappa =k/\rho c_{p}\;} is the thermal diffusivity with k thermal conductivity, c p {\displaystyle \,c_{p}\,} heat capacity
Dynamo_theory
Study of heat-sound interactions
and phase for the gas about a thermal penetration depth δ=√(2k/ω) away from the plate, where k is the thermal diffusivity of the gas and ω=2πf is the angular
Thermoacoustics
NASA Mars lander (2008)
regolith, heat the soil to measure thermal properties (thermal conductivity, specific heat and thermal diffusivity) of the regolith, and measure soil
Phoenix_(spacecraft)
Measurable property of a material or system
also be the same kind. For example, both kinematic viscosity and thermal diffusivity have dimension of square length per time (units of m2/s), but they
Physical_quantity
Chemical compound of sulfur and oxygen
completed by the early 2020s, some notable uncertainties remain. Table of thermal and physical properties of saturated liquid sulfur dioxide: Bunker fuel
Sulfur_dioxide
Process creating a thin layer of (usually) silicon dioxide
agent to diffuse into the wafer at high temperature and react with it. The rate of oxide growth is often predicted by the Deal–Grove model. Thermal oxidation
Thermal_oxidation
Technique for measuring thermal conductivity
for Thermal Conductivity, Thermal Diffusivity and Volumetric Heat Capacity of Engine Coolants and Related Fluids by Transient Hot Wire Liquid Thermal Conductivity
Transient_hot_wire_method
Repeated joining and separation of Earth's continents
t}}+d_{\rm {r}}} where κ is the thermal diffusivity of the mantle lithosphere (c. 8×10−7 m2/s), aeff is the effective thermal expansion coefficient for rock
Supercontinent_cycle
Distance a flow travels after entering a pipe before fully developed
techniques. The Schmidt number describes the ratio of momentum diffusivity to mass diffusivity. x f d , c ≈ 0.05 D R e D S c {\displaystyle x_{fd,c}\approx
Entrance length (fluid dynamics)
Entrance_length_(fluid_dynamics)
Dimensionless parameter in fluid mechanics
t_{F}=D_{T}/S_{L}^{2}} , where D T {\displaystyle D_{T}} is the thermal diffusivity and S L {\displaystyle S_{L}} is the laminar flame speed and the
Karlovitz_number
Chemical compound
glycerol that incorporates the -ol suffix common to alcohols. Table of thermal and physical properties of saturated liquid glycerin: Dioxalin Epichlorohydrin
Glycerol
DuPont high-performance plastics brand
°C without altering its thermal and mechanical properties.[citation needed] Extensive tables of measured thermal diffusivity, specific heat capacity,
Vespel
Dimensionless number in fluid dynamics
\mu } is the dynamic viscosity α {\displaystyle \alpha } is the thermal diffusivity The Be number plays in forced convection the same role that the Rayleigh
Bejan_number
Chemical element with atomic number 1 (H)
1016/0025-5416(88)90377-1. Kirchheim, R. (1988). "Hydrogen solubility and diffusivity in defective and amorphous metals". Progress in Materials Science. 32
Hydrogen
Poisonous gas consisting of carbon and oxygen
upon heating, leaving a carbonate as byproduct: Na2C2O4 → Na2CO3 + CO Thermal combustion is the most common source for carbon monoxide. Carbon monoxide
Carbon_monoxide
Materials whose temperature variance leads to voltage change
coefficient, figure of merit ZT, electrical and thermal conductivity, specific heat, and thermal diffusivity of the samples were also investigated, at high
Thermoelectric_materials
Topics referred to by the same term
"α") Coefficient of thermal expansion in thermodynamics (symbol "α") Fine-structure constant in physics (symbol "α") Thermal diffusivity in thermodynamics
Alpha_(disambiguation)
Earth's surface where water is frozen
[citation needed] Snow and ice have much lower thermal diffusivities than air. Thermal diffusivity is a measure of the speed at which temperature waves
Cryosphere
Fluid used as an intermediary in a cooling or heating process
much thermal energy it can transport and store, impacting the efficiency of the heat transfer process. Thermal conductivity and thermal diffusivity: These
Heat-transfer_fluid
Rate of temperature increase with depth in Earth's interior
upper few hundreds of meters near the surface. Because of the low thermal diffusivity of rocks, deep underground temperatures are hardly affected by diurnal
Geothermal_gradient
Chemical element with atomic number 42 (Mo)
carbon have higher melting points. It has one of the lowest coefficients of thermal expansion among commercially used metals. Molybdenum is a transition metal
Molybdenum
Type of heat transfer within fluids
acceleration due to gravity ν is the kinematic viscosity α is the thermal diffusivity β is the thermal expansion coefficient. As the Rayleigh number increases,
Rayleigh–Bénard_convection
Concept in fluid dynamics
thermal energy diffuses. For a liquid layer of thickness L {\displaystyle L} , viscosity μ {\displaystyle \mu } and thermal diffusivity α {\displaystyle
Marangoni_number
Crystal that develops with a typical multi-branching form
This hypothesis used a stability parameter σ which depended on the thermal diffusivity, the surface tension and the radius of the tip of the dendrite. They
Dendrite_(crystal)
Thermal quality
the thermal conductivity and thermal diffusivity correlation. The volumetric heat capacity of liquids could be directly obtained during thermal conductivity
Volumetric_heat_capacity
Chemical compound
liquid form, exposure to heat could cause the can to explode. Table of thermal and physical properties of saturated liquid refrigerant 12: CFC-12 measured
Dichlorodifluoromethane
Concept in partial differential equations
={\frac {k}{\rho c_{p}}}} with α {\displaystyle \alpha } being the thermal diffusivity. By introducing the similarity variable η = x / t {\displaystyle
Self-similar_solution
Chemical propellant and refrigerant
viscosity (kg/m s) Kinematic viscosity (m^2/s) Conductivity (W/m K) Thermal diffusivity (m^2/s) Prandtl Number Bulk modulus (K^-1) 230 1416 1.087 3.56E-04
Chlorodifluoromethane
Type of partial differential equation
phases have thermal diffusivities α 1 {\displaystyle \alpha _{1}} and α 2 {\displaystyle \alpha _{2}} . For example, the thermal diffusivity of water is
Free_boundary_problem
Organic compound ethane-1,2-diol
industry as glycol concentrates, compounds, mixtures, or solutions. Table of thermal and physical properties of saturated liquid ethylene glycol: Pure ethylene
Ethylene_glycol
Measurement unit derived from basic metric value
irradiance kg⋅s−3 square metre per second m2/s kinematic viscosity, thermal diffusivity, diffusion coefficient m2⋅s−1 pascal-second Pa⋅s = N⋅s/m2 dynamic
SI_derived_unit
Method of casting near-net-shape metal components
with argon, because of the differences in thermal diffusivity of the two atomising gases: argon has a thermal conductivity of 0.0179 W/mK, which is approximately
Spray_forming
Chemical element with atomic number 2 (He)
conditions. Because of helium's relatively low molar (atomic) mass, its thermal conductivity, specific heat, and sound speed in the gas phase are all greater
Helium
Chemical element with atomic number 7 (N)
the thermal decomposition of ammonium dichromate. 3(NH4)2Cr2O7 → 2N2 + 9H2O + 3Cr2O3 + 2NH3 + 3⁄2O2 Very pure nitrogen can be prepared by the thermal decomposition
Nitrogen
Chemical compound (C5H12)
Ying Zhang, Mao-Gang He, Xiong Zheng, and Li-Bin Chen (2014): "Thermal Diffusivity and Speed of Sound of Saturated Pentane from Light Scattering". International
Isopentane
{\kappa }{\rho C}}} , the thermal diffusivity and g {\displaystyle g} is the rate of heat generation per unit volume. Heat diffuses from the source following
Thermal simulations for integrated circuits
Thermal_simulations_for_integrated_circuits
Thermal welding technique for joining thermoplastics
temperature, κ is the thermal diffusivity, and erfc is the complementary error function. This model is valid for most cases, since the thermal contact resistance
Hot_plate_welding
Global warming about 55 million years ago
Paleocene–Eocene thermal maximum (PETM), alternatively "Eocene thermal maximum 1 (ETM1)" and formerly known as the "Initial Eocene" or "Late Paleocene thermal maximum"
Paleocene–Eocene thermal maximum
Paleocene–Eocene_thermal_maximum
Model compatible with special relativity
^{2}\theta ,} where θ is temperature, t is time, α = k/(ρ c) is thermal diffusivity, k is thermal conductivity, ρ is density, and c is specific heat capacity
Relativistic_heat_conduction
Preparing food using heat
an object, thermal conductivity, and (perhaps most significantly) the temperature difference between the two objects. Thermal diffusivity is the combination
Cooking
American physicist (1939–2026)
17 July 2026. Swinney, H. L.; Cummins, Herman Z. (1968-07-05). "Thermal Diffusivity of CO2 in the Critical Region". Physical Review. 171 (1). American
Harry_Swinney
Electromagnetic radiation generated by the thermal motion of particles
Thermal radiation is electromagnetic radiation emitted by the thermal motion of particles in matter. All matter with a temperature greater than absolute
Thermal_radiation
Satisfaction with the thermal environment
Thermal comfort is the condition of mind that expresses subjective satisfaction with the thermal environment. The human body can be viewed as a heat engine
Thermal_comfort
Class of second-order linear partial differential equations
and α {\displaystyle \alpha } is a positive constant called the thermal diffusivity. The heat equation says, roughly, that temperature at a given time
Parabolic partial differential equation
Parabolic_partial_differential_equation
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