ASTM E1142-11b

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.

General Information

• Status: Historical
• Publication Date: 31-Jul-2011
• ICS: 01.040.17 - Metrology and measurement. Physical phenomena (Vocabularies)
• ICS: 17.200.10 - Heat. Calorimetry
• Technical Committee: E37 - Thermal Measurements
• Drafting Committee: E37.03 - Nomenclature and Definitions

Relations

• Replaces: ASTM E1142-11a - Standard Terminology Relating to Thermophysical Properties
• Effective Date: 01-Aug-2011
• Replaced By: ASTM E1142-12 - Standard Terminology Relating to Thermophysical Properties
• Effective Date: 01-Sep-2012
• Referred By: ASTM E2041-23 - Standard Test Method for Estimating Kinetic Parameters by Differential Scanning Calorimeter Using the Borchardt and Daniels Method
• Effective Date: 01-Aug-2011
• Referred By: ASTM E3007-21 - Standard Practice for Selection and Use of Kinetic Reference Values in the Study of Decomposition Reactions by Thermogravimetry
• Effective Date: 01-Aug-2011
• Referred By: ASTM E794-06(2018) - Standard Test Method for Melting And Crystallization Temperatures By Thermal Analysis
• Effective Date: 01-Aug-2011
• Referred By: ASTM E2550-21 - Standard Test Method for Thermal Stability by Thermogravimetry
• Effective Date: 01-Aug-2011
• Referred By: ASTM E2206-21 - Standard Test Method for Force Calibration of Thermomechanical Analyzers
• Effective Date: 01-Aug-2011
• Referred By: ASTM E1824-19 - Standard Test Method for Assignment of a Glass Transition Temperature Using Thermomechanical Analysis: Tension Method
• Effective Date: 01-Aug-2011
• Referred By: ASTM E3142-18a(2023) - Standard Test Method for Thermal Lag of Thermal Analysis Apparatus
• Effective Date: 01-Aug-2011
• Referred By: ASTM D3418-21 - Standard Test Method for Transition Temperatures and Enthalpies of Fusion and Crystallization of Polymers by Differential Scanning Calorimetry
• Effective Date: 01-Aug-2011
• Referred By: ASTM F3384-21 - Standard Specification for Polydioxanone Polymer Resins for Surgical Implants
• Effective Date: 01-Aug-2011
• Referred By: ASTM E3174-22 - Standard Practice for Determination of Kinetic Reaction Model Using Differential Scanning Calorimetry
• Effective Date: 01-Aug-2011
• Referred By: ASTM E1131-20 - Standard Test Method for Compositional Analysis by Thermogravimetry
• Effective Date: 01-Aug-2011
• Referred By: ASTM E2603-15(2023) - Standard Practice for Calibration of Fixed-Cell Differential Scanning Calorimeters
• Effective Date: 01-Aug-2011
• Referred By: ASTM E2254-23 - Standard Test Method for Storage Modulus Calibration of Dynamic Mechanical Analyzers
• Effective Date: 01-Aug-2011

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: E1142 − 11b
StandardTerminology
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 (α) 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
properties. Terms that are generally understood or defined
angular frequency, ω, n—the number of radians per second
adequately in other readily available sources are either not
traversedbyarotatingvectorthatrepresentsanyperiodically
included or their sources identified.
varying quantity.
DISCUSSION—Angular frequency, ω, is equal to two π times the
1.2 A definition is a single sentence with additional infor-
frequency, f.
mation included in a Discussion. It is reviewed every five
years, and the year of the last review or revision is appended.
anisotropic, adj—having different values for a property in
different directions.
1.3 Definitions identical to those published by another
standardsorganizationorASTMCommitteeareidentifiedwith
anti-thixotropy, n—anincreaseoftheapparentviscosityunder
the abbreviation of the name of the organization or the
constant shear stress or shear rate followed by a gradual
identifying document and ASTM Committee.
recovery when the stress or shear rate is reduced to zero.
1.4 Definitionsoftermsspecifictoaparticularfield(suchas
arrhenius equation, n—a mathematical relationship between
dynamic mechanical measurements) are identified with an
the specific reaction rate and the temperature given as:
italicized introductory phrase.
2E/RT
k 5 Ae (1)
2. Referenced Documents
where:
2
2.1 ASTM Standards:
k is the reaction rate constant, A is the frequency factor, E is
D4092 Terminology for Plastics: Dynamic Mechanical
the energy of activation, R is the gas constant, and T is the
Properties
absolute temperature.
E7Terminology Relating to Metallography
barometer, n—Aninstrumentformeasuringatmosphericpres-
E344Terminology Relating to Thermometry and Hydrom-
sure.
etry
beta (β) loss peak, n—in dynamic mechanical measurement,
3. Terminology
second discrete peak in damping curve below the melt, in
3.1 Definitions:
order of decreasing temperature or increasing frequency.
absolute pressure, n—pessure measured relative to zero pres-
D4092
sure corresponding to empty space.
boiling pressure, n—ataspecifictemperature,thevalueofthe
DISCUSSION—Absolute pressure is atmospheric pressure plus gage
vapor pressure of the liquid at which it is equal to the
pressure.
external pressure.
admittance, Y, n—the reciprocal of impedance.
boiling temperature, n—at a specific pressure, the tempera-
ture at which the vapor pressure of the liquid is equal to the
1
external pressure.
This terminology is under the jurisdiction of ASTM Committee E37 on
ThermalMeasurementsandarethedirectresponsibilityofSubcommitteeE37.03on
capacitance, n—that property of a system of conductors and
Nomenclature and Definitions.
Current edition approved Aug. 1, 2011. Published August 2011. Originally
dielectrics that permits the storage of electrical charge when
approved in 1988. Last previous edition approved in 2011 as E1142–11a. DOI:
a potential difference exists between the conductors.
10.1520/E1142-11B.
DISCUSSION—Capacitance is the ratio of a quantity of electric charge,
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Q, to a potential difference, V.Acapacitance value is always positive.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
The unit of capacitance is the farad, F, which is equivalent to one
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. coulomb per volt.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E1142 − 11b
Celsius, n—designation of the degree on the International conductivity, electrical (volume), σ, n—the ratio of the
−2
Practical Temperature Scale; also used for the name of the current density (A·cm ) through a specimen to the potential
scale, as “Celsius Temperature Scale.” Formerly (prior to gradient (V/cm) in the same direction as the current.
DISCUSSION—Conductivity is normally expressed in units
1948) called “Centigrade.” The Celsius temperature scale is
−1
(ohm·cm) , but the correct SI units are Siemen·m.
related to the Internati
...

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:E1142–11a Designation:E1142–11b
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
E344 Terminology Relating to Thermometry and Hydrometry
3. Terminology
3.1 Terms and Definitions:
absolute pressure, n—pessure measured relative to zero pressure corresponding to empty space.
DISCUSSION—Absolute pressure is atmospheric pressure plus gage pressure.
admittance, Y, n—the reciprocal of impedance.
alpha (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
angularfrequency, v, n—thenumberofradianspersecondtraversedbyarotatingvectorthatrepresentsanyperiodicallyvarying
quantity.
DISCUSSION—Angular frequency, v, is equal to two p times the frequency, f.
anisotropic, adj—having different values for a property in different directions.
anti-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.
barometer, n—An instrument for measuring atmospheric pressure.
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.
Current edition approved June 15,Aug. 1, 2011. Published JuneAugust 2011. Originally approved in 1988. Last previous edition approved in 2011 as E1142–11a. DOI:
10.1520/E1142-11AB.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,[e-mail] 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 ----------------------
E1142–11b
beta (b) loss peak, n—in dynamic mechanical measurement, second discrete peak in damping curve below the melt, in order of
decreasing temperature or increasing frequency. D4092
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.
boiling temperature, n—at a specific pressure, the temperature at which the vapor pressure of the liquid is equal to the external
pressure.
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.
DISCUSSION—Capacitance is the ratio of a quantity of electric charge, 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.
Celsius, n—designation of the degree on the International Practical Temperature Scale; also used for the name of the scale, as
“Celsius Temperature Scale.” Formerly (prior to 1948) called “Centigrade.” The Celsius temperature scale
...