ASTM E1142-11a
(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.
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:E1142–11a
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 alpha (a) loss peak, n—in dynamic mechanical measurement,
first peak in the damping curve below the melt, in order of
1.1 This is a compilation of terms and corresponding
decreasing temperature or increasing frequency. E7
definitions commonly used in the study of thermophysical
angular frequency, v, n—the number of radians per second
properties. Terms that are generally understood or defined
traversedbyarotatingvectorthatrepresentsanyperiodically
adequately in other readily available sources are either not
varying quantity.
included or their sources identified.
1.2 A definition is a single sentence with additional infor-
DISCUSSION—Angular frequency, v, is equal to two p times the
mation included in a Discussion. It is reviewed every five
frequency, f.
years, and the year of the last review or revision is appended.
anti-thixotropy, n—an increase of the apparent viscosity
1.3 Definitions identical to those published by another
under constant shear stress or shear rate followed by a
standardsorganizationorASTMCommitteeareidentifiedwith
gradual recovery when the stress or shear rate is reduced to
the abbreviation of the name of the organization or the
zero.
identifying document and ASTM Committee.
arrhenius equation, n—a mathematical relationship between
1.4 Definitionsoftermsspecifictoaparticularfield(suchas
the specific reaction rate and the temperature given as:
dynamic mechanical measurements) are identified with an
–E/RT
italicized introductory phrase. k 5 Ae (1)
2. Referenced Documents
where:
2
2.1 ASTM Standards:
kisthereactionrateconstant, Aisthefrequencyfactor, Eisthe
D4092 Terminology for Plastics: Dynamic Mechanical
energyofactivation, Risthegasconstant,and Tistheabsolute
Properties
temperature.
E7 Terminology Relating to Metallography
barometer, n—Aninstrumentformeasuringatmosphericpres-
E344 Terminology Relating to Thermometry and Hydrom-
sure.
etry
beta (b) loss peak, n—in dynamic mechanical measurement,
second discrete peak in damping curve below the melt, in
3. Terminology
order of decreasing temperature or increasing frequency.
3.1 Terms and Definitions:
D4092
boiling pressure, n—ataspecifictemperature,thevalueofthe
absolute pressure, n—pessure measured relative to zero
vapor pressure of the liquid at which it is equal to the
pressure corresponding to empty space.
external pressure.
DISCUSSION—Absolute pressure is atmospheric pressure plus gage
boiling temperature, n—at a specific pressure, the tempera-
pressure.
ture at which the vapor pressure of the liquid is equal to the
external pressure.
admittance, Y, n—the reciprocal of impedance.
capacitance, n—that property of a system of conductors and
dielectrics that permits the storage of electrical charge when
a potential difference exists between the conductors.
1
This terminology is under the jurisdiction of ASTM Committee E37 on
ThermalMeasurementsandarethedirectresponsibilityofSubcommitteeE37.03on
DISCUSSION—Capacitance is the ratio of a quantity of electric charge,
Nomenclature and Definitions.
Q, to a potential difference, V.Acapacitance value is always positive.
Current edition approved June 15, 2011. Published June 2011. Originally
The unit of capacitance is the farad, F, which is equivalent to one
approved in 1988. Last previous edition approved in 2011 as E1142–11. DOI:
coulomb per volt.
10.1520/E1142-11A.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Celsius, n—designation of the degree on the International
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Practical Temperature Scale; also used for the name of the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. scale, as “Celsius Temperature Scale.” Formerly (prior to
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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E1142–11a
1948) called “Centigrade.” The Celsius temperature scale is congruent transformation, n—an isothermal, or isobaric,
related to the International Kelvin Temperature Scale by the phasechangeinwhichbothofthephasesconcernedhavethe
equation: T =T−273.16K. same composition throughout the process; the order of a
c
Centigrade, n—see Celsius. system becomes unary at a composition of congruency. E7
coeffıcient of expansion, n—see coefficient of linear thermal
con
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:E1142–11 Designation:E1142–11a
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
1.1 This is a compilation of terms and corresponding definitions commonly used in the study of thermophysical properties.
Termsthataregenerallyunderstoodordefinedadequatelyinotherreadilyavailablesourcesareeithernotincludedortheirsources
identified.
1.2 Adefinition 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.
1.4 Definitions of terms specific to a particular field (such as dynamic mechanical measurements) are identified with an
italicized introductory phrase.
2. Referenced Documents
2
2.1 ASTM Standards:
D4092 Terminology for Plastics: Dynamic Mechanical Properties
E7 Terminology Relating to Metallography Terminology Relating to Metallography
E344 Terminology Relating to Thermometry and Hydrometry
3. Terminology
3.1 Terms and Definitions:
absolute pressureabsolute pressure, n—pessure measured relative to zero pressure corresponding to empty space.
DISCUSSION—Absolute pressure is atmospheric pressure plus gage pressure.
admittance, YY, n—the reciprocal of impedance.
alpha (a) loss peakalpha (a) loss peak, n—in dynamic mechanical measurement, first peak in the damping curve below the melt,
in order of decreasing temperature or increasing frequency (. E7 , E04) (1988).
angular frequency, vangularfrequency, v, n—thenumberofradianspersecondtraversedbyarotatingvectorthatrepresentsany
periodically varying quantity.
DISCUSSION—Angular frequency, v, is equal to two p times the frequency, f.
anti-thixotropyanti-thixotropy, n—an increase of the apparent viscosity under constant shear stress or shear rate followed by a
gradual recovery when the stress or shear rate is reduced to zero.
arrhenius equation, n—a mathematical relationship between the specific reaction rate and the temperature given as:
–E/RT
k 5 Ae (1)
where:
k is the reaction rate constant, A is the frequency factor, E is the energy of activation, R is the gas constant, and T is the absolute
temperature (1990). is the absolute temperature.
barometerbarometer, n—An instrument for measuring atmospheric pressure.
beta (b) loss peakbeta (b) loss peak, n—in dynamic mechanical measurement, second discrete peak in damping curve below the
1
This terminology is under the jurisdiction of ASTM Committee E37 on Thermal Measurements and are the direct responsibility of Subcommittee E37.03 on
Nomenclature and Definitions.
CurrenteditionapprovedApril1,June15,2011.PublishedMayJune2011.Originallyapprovedin1988.Lastpreviouseditionapprovedin20102011asE1142–101.DOI:
10.1520/E1142-11A.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
E1142–11a
melt, in order of decreasing temperature or increasing frequency (. D4092 , D20) (1988).
boiling pressure, n—at a specific temperature, the value of the vapor pressure of the liquid at which it is equal to the external
pressure (1988). pressure.
boiling temperature, n—at a specific pressure, the temperature at which the vapor pressure of the liquid is equal to the external
pressure (1988). pressure.
capacitancecapacitance, n—that property of a system of conductors and dielectrics that permits the storage of electrical charge
when a potential difference exists between the conductors.
DISCUSSION—Capacitanceistheratioofaquantityofelectriccharge, Q,toapotentialdifference, V.Acapacitancevalueisalwayspositive.Theunit
of capacitance is the farad, F, which is equivalent to one coulomb per volt.
Celsius, n—designation of the degree on the International Practical Temperature Scale; also used f
...
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