ASTM E1142-06a
(Terminology)Standard Terminology Relating to Thermophysical Properties
Standard Terminology Relating to Thermophysical Properties
SCOPE
1.1 This is a compilation of terms and corresponding definitions commonly used in the study of thermophysical properties. Terms that are generally understood or defined adequately in other readily available sources are either not included or their sources identified.
1.2 A definition is a single sentence with additional information included in a Discussion. It is reviewed every five years, and the year of the last review or revision is appended.
1.3 Definitions identical to those published by another standards organization or ASTM Committee are identified with the abbreviation of the name of the organization or the identifying document and ASTM Committee; for example, ICTA is the International Confederation for Thermal Analysis.
1.4 Definitions of terms specific to a particular field (such as dynamic mechanical measurements) are identified with an italicized introductory phrase.
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Designation:E1142–06a
Standard Terminology
1
Relating to Thermophysical Properties
This standard is issued under the fixed designation E1142; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope angular frequency, v—the number of radians per second
traversedbyarotatingvectorthatrepresentsanyperiodically
1.1 This is a compilation of terms and corresponding
varying quantity.
definitions commonly used in the study of thermophysical
properties. Terms that are generally understood or defined
DISCUSSION—Angular frequency, v, is equal to two p times the
adequately in other readily available sources are either not frequency, f.
included or their sources identified.
anti-thixotropy—an increase of the apparent viscosity under
1.2 A definition is a single sentence with additional infor-
constant shear stress or shear rate followed by a gradual
mation included in a Discussion. It is reviewed every five
recovery when the stress or shear rate is reduced to zero.
years, and the year of the last review or revision is appended.
arrhenius equation—amathematicalrelationshipbetweenthe
1.3 Definitions identical to those published by another
specific reaction rate and the temperature given as
standardsorganizationorASTMCommitteeareidentifiedwith
–E/RT
the abbreviation of the name of the organization or the k 5 Ae (1)
identifying document and ASTM Committee; for example,
where:
ICTAis the International Confederation for ThermalAnalysis.
kisthereactionrateconstant, Aisthefrequencyfactor, Eisthe
1.4 Definitionsoftermsspecifictoaparticularfield(suchas
energyofactivation, Risthegasconstant,and Tistheabsolute
dynamic mechanical measurements) are identified with an
temperature, (1990).
italicized introductory phrase.
beta (b) loss peak—in dynamic mechanical measurement,
second discrete peak in damping curve below the melt, in
2. Referenced Documents
order of decreasing temperature or increasing frequency,
2
2.1 ASTM Standards:
(D4092, D-20), (1988).
D4092 Terminology for Plastics: Dynamic Mechanical
boiling pressure—at a specific temperature, the value of the
Properties
vapor pressure of the liquid at which it is equal to the
E7 Terminology Relating to Metallography
external pressure, (1988).
boiling temperature—at a specific pressure, the temperature
3. Terminology
at which the vapor pressure of the liquid is equal to the
3.1 Terms and Definitions:
external pressure, (1988).
capacitance—that property of a system of conductors and
admittance, Y— the reciprocal of impedance.
dielectrics that permits the storage of electrical charge when
alpha (a) loss peak—in dynamic mechanical measurement,
a potential difference exists between the conductors.
first peak in the damping curve below the melt, in order of
decreasing temperature or increasing frequency, (D4092,
DISCUSSION—Capacitance is the ratio of a quantity of electric charge,
D-20), (1988).
Q, to a potential difference, V.Acapacitance value is always positive.
The unit of capacitance is the farad, F, which is equivalent to one
coulomb per volt.
1
This terminology is under the jurisdiction of ASTM Committee E37 on
Celsius—designation of the degree on the International Prac-
ThermalMeasurementsandarethedirectresponsibilityofSubcommitteeE37.03on
tical Temperature Scale; also used for the name of the scale,
Nomenclature and Definitions.
as “Celsius Temperature Scale.” Formerly (prior to 1948)
Current edition approved Nov. 1, 2006. Published December 2006. Originally
approved in 1988. Last previous edition approved in 2006 as E1142–06.
called“Centigrade.”TheCelsiustemperaturescaleisrelated
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
to the International Kelvin Temperature Scale by the equa-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
tion T =T − 273.16K, (1988).
Standards volume information, refer to the standard’s Document Summary page on c
the ASTM website. Centigrade—see Celsius.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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E1142–06a
coeffıcient of expansion— see coefficient of linear thermal becomes unary at a composition of congruency, (E7, E-4),
expansion. (1988).
coefficient of linear thermal expansion, a —change in constitutional diagram—graphicalrepresentationofthecom-
l
length, relative to the length of the specimen, accompanying positions, temperatures, pressures, or combinations thereof
a unit change of temperature, at a specified temperature, at which the heterogeneous equilibria of a system occur
...
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