ASTM E1142-07

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Designation:E1142–07
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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope traversedbyarotatingvectorthatrepresentsanyperiodically
varying quantity.
1.1 This is a compilation of terms and corresponding
definitions commonly used in the study of thermophysical
DISCUSSION—Angular frequency, v, is equal to two p times the
properties. Terms that are generally understood or defined
frequency, f.
adequately in other readily available sources are either not
anti-thixotropy—an increase of the apparent viscosity under
included or their sources identified.
constant shear stress or shear rate followed by a gradual
1.2 A definition is a single sentence with additional infor-
recovery when the stress or shear rate is reduced to zero.
mation included in a Discussion. It is reviewed every five
arrhenius equation—amathematicalrelationshipbetweenthe
years, and the year of the last review or revision is appended.
specific reaction rate and the temperature given as
1.3 Definitions identical to those published by another
–E/RT
k 5 Ae (1)
standardsorganizationorASTMCommitteeareidentifiedwith
the abbreviation of the name of the organization or the
where:
identifying document and ASTM Committee; for example,
kisthereactionrateconstant, Aisthefrequencyfactor, Eisthe
ICTAis the International Confederation for ThermalAnalysis.
energyofactivation, Risthegasconstant,and Tistheabsolute
1.4 Definitionsoftermsspecifictoaparticularfield(suchas
temperature, (1990).
dynamic mechanical measurements) are identified with an
beta (b) loss peak—in dynamic mechanical measurement,
italicized introductory phrase.
second discrete peak in damping curve below the melt, in
order of decreasing temperature or increasing frequency,
2. Referenced Documents
(D4092, D-20), (1988).
2
2.1 ASTM Standards:
boiling pressure—at a specific temperature, the value of the
D4092 Terminology for Plastics: Dynamic Mechanical
vapor pressure of the liquid at which it is equal to the
Properties
external pressure, (1988).
E7 Terminology Relating to Metallography
boiling temperature—at a specific pressure, the temperature
at which the vapor pressure of the liquid is equal to the
3. Terminology
external pressure, (1988).
3.1 Terms and Definitions:
capacitance—that property of a system of conductors and
dielectrics that permits the storage of electrical charge when
admittance, Y—the reciprocal of impedance.
a potential difference exists between the conductors.
alpha (a) loss peak—in dynamic mechanical measurement,
first peak in the damping curve below the melt, in order of
DISCUSSION—Capacitance is the ratio of a quantity of electric charge,
decreasing temperature or increasing frequency, (D4092,
Q, to a potential difference, V.Acapacitance value is always positive.
D-20), (1988). The unit of capacitance is the farad, F, which is equivalent to one
coulomb per volt.
angular frequency, v—the number of radians per second
Celsius—designation of the degree on the International Prac-
tical Temperature Scale; also used for the name of the scale,
1
This terminology is under the jurisdiction of ASTM Committee E37 on as “Celsius Temperature Scale.” Formerly (prior to 1948)
ThermalMeasurementsandarethedirectresponsibilityofSubcommitteeE37.03on
called“Centigrade.”TheCelsiustemperaturescaleisrelated
Nomenclature and Definitions.
to the International Kelvin Temperature Scale by the equa-
Current edition approved March 1, 2007. Published April 2007. Originally
tion T =T − 273.16K, (1988).
approved in 1988. Last previous edition approved in 2006 as E1142–06a. DOI:
c
10.1520/E1142-07.
Centigrade—see Celsius.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
coeffıcient of expansion— see coefficient of linear thermal
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
expansion.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. coefficient of linear thermal expansion, a —change in
l
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E1142–07
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,
(1988). (1988).
coefficient of viscosity—the ratio between an infinitesimally cooling curve—graphical
...