Information about Volumetric Heat Capacity
Volumetric heat capacity (VHC) describes the ability of a given volume of a substance to store heat while undergoing a given temperature change, but without undergoing a phase change. It is different from specific heat capacity in that the VHC depends on the volume of the material, while the specific heat is based on the mass of the material. If given a specific heat value of a substance, one can convert it to the VHC by multiplying the specific heat by the density of the substance. [1]
Dulong and Petit predicted in 1818 that ρcp would be constant for all solids (the Dulong-Petit law). In fact, the quantity varies from about 1.2 to 4.5 MJ/m³K. For fluids it is in the range 1.3 to 1.9, and for gases it is a constant 1.0 kJ/m³K .
The volumetric heat capacity is defined as having SI units of J/(m³·K). It can also be described in Imperial units of BTU/(ft³·F°).
The term is a scientific analogy, and is not directly related to the mass-and-velocity term used in mechanics, where inertia is that which limits the acceleration of an object. In a similar way, thermal inertia is a measure of the thermal mass and the velocity of the thermal wave which controls the surface temperature of a material. In heat transfer, a higher value of the volumetric heat capacity means a longer time for the system to reach equilibrium.
The thermal inertia of a material is defined as a the square root of the product of the material's bulk thermal conductivity and volumetric heat capacity, where the latter is the product of density and specific heat capacity:
SI units of thermal inertia are J m
K
s or, equivalently, tiu[2].
For planetary surface materials, thermal inertia is the key property controlling the diurnal and seasonal surface temperature variations and is typically dependent on the physical properties of near-surface geologic materials. In remote sensing applications, thermal inertia represents a complex combination of particle size, rock abundance, bedrock outcropping and the degree of induration. A rough approximation to thermal inertia is sometimes obtained from the amplitude of the diurnal temperature curve (i.e., maximum minus minimum surface temperature). The temperature of a material with low thermal inertia changes significantly during the day, while the temperature of a material with high thermal inertia does not change as drastically. Deriving and understanding the thermal inertia of the surface can help to recognize small-scale features of that surface. In conjunction with other data, thermal inertia can help to characterize surface materials and the geologic processes responsible for forming these materials.
An abstract model (or conceptual model) is a theoretical construct that represents something, with a set of variables and a set of logical and quantitative relationships between them.
..... Click the link for more information.
Mechanics (Greek Μηχανική
..... Click the link for more information.
Dulong and Petit predicted in 1818 that ρcp would be constant for all solids (the Dulong-Petit law). In fact, the quantity varies from about 1.2 to 4.5 MJ/m³K. For fluids it is in the range 1.3 to 1.9, and for gases it is a constant 1.0 kJ/m³K .
The volumetric heat capacity is defined as having SI units of J/(m³·K). It can also be described in Imperial units of BTU/(ft³·F°).
Thermal inertia
Thermal inertia is a term commonly used by scientists and engineers modelling heat transfers and is a bulk material property related to thermal conductivity and volumetric heat capacity. For example, this material has a high thermal inertia, or thermal inertia plays an important role in this system, which means that dynamic effects are prevalent in a model, so that a steady-state calculation will yield inaccurate results.The term is a scientific analogy, and is not directly related to the mass-and-velocity term used in mechanics, where inertia is that which limits the acceleration of an object. In a similar way, thermal inertia is a measure of the thermal mass and the velocity of the thermal wave which controls the surface temperature of a material. In heat transfer, a higher value of the volumetric heat capacity means a longer time for the system to reach equilibrium.
The thermal inertia of a material is defined as a the square root of the product of the material's bulk thermal conductivity and volumetric heat capacity, where the latter is the product of density and specific heat capacity:
- :
SI units of thermal inertia are J m
K s or, equivalently, tiu[2].
For planetary surface materials, thermal inertia is the key property controlling the diurnal and seasonal surface temperature variations and is typically dependent on the physical properties of near-surface geologic materials. In remote sensing applications, thermal inertia represents a complex combination of particle size, rock abundance, bedrock outcropping and the degree of induration. A rough approximation to thermal inertia is sometimes obtained from the amplitude of the diurnal temperature curve (i.e., maximum minus minimum surface temperature). The temperature of a material with low thermal inertia changes significantly during the day, while the temperature of a material with high thermal inertia does not change as drastically. Deriving and understanding the thermal inertia of the surface can help to recognize small-scale features of that surface. In conjunction with other data, thermal inertia can help to characterize surface materials and the geologic processes responsible for forming these materials.
Constant volume and constant pressure.
For gases it is useful to distinguish between volumetric heat capacity at constant volume and at constant pressure. This distinction has the same meaning as for specific heat capacity.References
1. ^ U.S. Army Corps of Engineers Technical Manual: Arctic and Subarctic Construction: Calculation Methods for Determination of Depths of Freeze and Thaw in Soils, TM 5-852-6/AFR 88-19, Volume 6, 1988, Equation 2-1
2. ^ Thermal inertia and surface heterogeneity on Mars, N. E. Putzig, University of Colorado Ph. D. dissertation, 2006, 195 pp.
2. ^ Thermal inertia and surface heterogeneity on Mars, N. E. Putzig, University of Colorado Ph. D. dissertation, 2006, 195 pp.
See also
The volume of a solid object is the three-dimensional concept of how much space it occupies, often quantified numerically. One-dimensional figures (such as lines) and two-dimensional shapes (such as squares) are assigned zero volume in the three-dimensional space.
..... Click the link for more information.
..... Click the link for more information.
Editing of this page by unregistered or newly registered users is currently disabled due to vandalism.
If you are prevented from editing this page, and you wish to make a change, please discuss changes on the talk page, request unprotection, log in, or .
..... Click the link for more information.
If you are prevented from editing this page, and you wish to make a change, please discuss changes on the talk page, request unprotection, log in, or .
..... Click the link for more information.
trillion fold).]]
Temperature is a physical property of a system that underlies the common notions of hot and cold; something that is hotter generally has the greater temperature. Temperature is one of the principal parameters of thermodynamics.
..... Click the link for more information.
Temperature is a physical property of a system that underlies the common notions of hot and cold; something that is hotter generally has the greater temperature. Temperature is one of the principal parameters of thermodynamics.
..... Click the link for more information.
phase transition or phase change is the transformation of a thermodynamic system from one phase to another. The distinguishing characteristic of a phase transition is an abrupt change in one or more physical properties, in particular the heat capacity, with a small change in
..... Click the link for more information.
..... Click the link for more information.
Specific heat capacity, also known simply as specific heat, is the measure of the heat energy required to increase the temperature of a unit quantity of a substance by a certain temperature interval.
..... Click the link for more information.
..... Click the link for more information.
Mass is a fundamental concept in physics, roughly corresponding to the intuitive idea of "how much matter there is in an object". Mass is a central concept of classical mechanics and related subjects, and there are several definitions of mass within the framework of relativistic
..... Click the link for more information.
..... Click the link for more information.
Multiplication is the mathematical operation of adding together multiple copies of the same number. For example, four multiplied by three is twelve, since three sets of four make twelve:
..... Click the link for more information.
..... Click the link for more information.
In physics, density is mass m per unit volume V—how heavy something is compared to its size. A small, heavy object, such as a rock or a lump of lead, is denser than a lighter object of the same size or a larger object of the same weight, such as pieces of
..... Click the link for more information.
..... Click the link for more information.
Pierre Louis Dulong (February 12, 1785 – July 19, 1838) was a French physicist and chemist.
Dulong was born in Rouen, France. He worked on the specific heat capacity and the expansion and refractive indices of gases.
..... Click the link for more information.
Dulong was born in Rouen, France. He worked on the specific heat capacity and the expansion and refractive indices of gases.
..... Click the link for more information.
Alexis Thérèse Petit (October 2, 1791 - June 21, 1820) was a French physicist. Petit is known for is work on the efficiencies of air- and steam-engines, published in 1818. His well-known discussions with the French physicist Sadi Carnot, founder of thermodynamics, may have
..... Click the link for more information.
..... Click the link for more information.
18th century - 19th century - 20th century
1780s 1790s 1800s - 1810s - 1820s 1830s 1840s
1815 1816 1817 - 1818 - 1819 1820 1821
:
Subjects: Archaeology - Architecture -
..... Click the link for more information.
1780s 1790s 1800s - 1810s - 1820s 1830s 1840s
1815 1816 1817 - 1818 - 1819 1820 1821
:
Subjects: Archaeology - Architecture -
..... Click the link for more information.
The Dulong-Petit law, a chemical law proposed in 1819 by French chemists Pierre Louis Dulong and Alexis Thérèse Petit, states the classical expression for the specific heat capacity of a crystal due to its lattice vibrations.
..... Click the link for more information.
..... Click the link for more information.
Si, si, or SI may refer to (all SI unless otherwise stated):
In language:
..... Click the link for more information.
In language:
- One of two Italian words:
- sì (accented) for "yes"
- si
..... Click the link for more information.
The joule (IPA: [dʒuːl] or [dʒaʊl]) (symbol: J) is the SI unit of energy.
..... Click the link for more information.
..... Click the link for more information.
cubic metre (symbol m³) is the SI derived unit of volume. It is the volume of a cube with edges one metre in length. In the United States it is spelled cubic meter. An alternate name, which allowed a different usage with SI prefixes, was the stère.
..... Click the link for more information.
..... Click the link for more information.
The kelvin (symbol: K) is a unit increment of temperature and is one of the seven SI base units. The Kelvin scale is a thermodynamic (absolute) temperature scale where absolute zero — the coldest possible temperature — is zero kelvins
..... Click the link for more information.
..... Click the link for more information.
British thermal unit (BTU or Btu) is a unit of energy used in the United States of America, particularly in the power, steam generation and heating and air conditioning industries.
..... Click the link for more information.
..... Click the link for more information.
A cubic foot is an Imperial / U.S. customary (non-metric) unit of volume, used in the United States, Canada and the UK. It is defined as the volume of a cube with sides of 1 foot (0.3048 m) in length.
..... Click the link for more information.
..... Click the link for more information.
Fahrenheit is a temperature scale named after the German-Dutch physicist Daniel Gabriel Fahrenheit (1686–1736), who proposed it in 1724.
In this scale, the melting point of water is 32 degrees Fahrenheit (written “32 °F”), and the boiling point is
..... Click the link for more information.
In this scale, the melting point of water is 32 degrees Fahrenheit (written “32 °F”), and the boiling point is
..... Click the link for more information.
This article or section may contain original research or unverified claims.
..... Click the link for more information.
Please help Wikipedia by adding references. See the for details.
This article has been tagged since September 2007.
This article has been tagged since September 2007.
- ''This article is about the profession.
..... Click the link for more information.
engineer is someone who is trained or professionally engaged in a branch of engineering.[1] Engineers use technology, mathematics, and scientific knowledge to solve practical problems.
..... Click the link for more information.
..... Click the link for more information.
In thermal physics, heat transfer is the passage of thermal energy from a hot to a cold body. When a physical body, e.g. an object or fluid, is at a different temperature than its surroundings or another body, transfer of thermal energy
..... Click the link for more information.
..... Click the link for more information.
thermal conductivity, k, is the property of a material that indicates its ability to conduct heat. It is used primarily in Fourier's Law for heat conduction.
It is defined as the quantity of heat, ΔQ, transmitted during time Δt
..... Click the link for more information.
It is defined as the quantity of heat, ΔQ, transmitted during time Δt
..... Click the link for more information.
For other uses, see Model.
An abstract model (or conceptual model) is a theoretical construct that represents something, with a set of variables and a set of logical and quantitative relationships between them.
..... Click the link for more information.
For other uses, see Mechanic (disambiguation).
Mechanics (Greek Μηχανική
..... Click the link for more information.
Inertia is a property of matter by which it remains at rest or in uniform motion in the same straight line unless acted upon by some external force The principle of inertia is one of the fundamental principles of classical physics which are used to describe the motion of matter and
..... Click the link for more information.
..... Click the link for more information.
acceleration is defined as the rate of change of velocity, or, equivalently, as the second derivative of position. It is thus a vector quantity with dimension length/time². In SI units, acceleration is measured in metres/second² (m·s-²).
..... Click the link for more information.
..... Click the link for more information.
In thermal physics, heat transfer is the passage of thermal energy from a hot to a cold body. When a physical body, e.g. an object or fluid, is at a different temperature than its surroundings or another body, transfer of thermal energy
..... Click the link for more information.
..... Click the link for more information.
thermodynamic equilibrium when it is in thermal equilibrium, mechanical equilibrium, and chemical equilibrium. The local state of a system at thermodynamic equilibrium is determined by the values of its intensive parameters, as pressure, temperature, etc.
..... Click the link for more information.
..... Click the link for more information.
thermal conductivity, k, is the property of a material that indicates its ability to conduct heat. It is used primarily in Fourier's Law for heat conduction.
It is defined as the quantity of heat, ΔQ, transmitted during time Δt
..... Click the link for more information.
It is defined as the quantity of heat, ΔQ, transmitted during time Δt
..... Click the link for more information.
This article is copied from an article on Wikipedia.org - the free encyclopedia created and edited by online user community. The text was not checked or edited by anyone on our staff. Although the vast majority of the wikipedia encyclopedia articles provide accurate and timely information please do not assume the accuracy of any particular article. This article is distributed under the terms of GNU Free Documentation License.
Herod_Archelaus
