ASTM E1142-05

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Designation:E1142–05
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 decreasing temperature or increasing frequency, (D4092,
D-20), (1988).
1.1 This is a compilation of terms and corresponding
angular frequency, v—the number of radians per second
definitions commonly used in the study of thermophysical
traversedbyarotatingvectorthatrepresentsanyperiodically
properties. Terms that are generally understood or defined
varying quantity.
adequately in other readily available sources are either not
included or their sources identified.
DISCUSSION—Angular frequency, v, is equal to two p 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
anti-thixotropy—an increase of the apparent viscosity under
years, and the year of the last review or revision is appended.
constant shear stress or shear rate followed by a gradual
1.3 Definitions identical to those published by another
recovery when the stress or shear rate is reduced to zero.
standardsorganizationorASTMCommitteeareidentifiedwith
arrhenius equation—amathematicalrelationshipbetweenthe
the abbreviation of the name of the organization or the
specific reaction rate and the temperature given as
identifying document and ASTM Committee; for example,
–E/RT
ICTAis the International Confederation for ThermalAnalysis. k 5 Ae (1)
1.4 Definitionsoftermsspecifictoaparticularfield(suchas
where:
dynamic mechanical measurements) are identified with an
kisthereactionrateconstant, Aisthefrequencyfactor, Eisthe
italicized introductory phrase.
energyofactivation, Risthegasconstant,and Tistheabsolute
temperature, (1990).
2. Referenced Documents
beta (b) loss peak—in dynamic mechanical measurement,
2
2.1 ASTM Standards:
second discrete peak in damping curve below the melt, in
D2160 Test Method for Thermal Stability of Hydraulic
order of decreasing temperature or increasing frequency,
Fluids
(D4092, D-20), (1988).
D 4092 Terminology Relating to Dynamic Mechanical
boiling pressure—at a specific temperature, the value of the
Measurements on Plastics
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
DISCUSSION—Capacitance is the ratio of a quantity of electric charge,
Q, to a potential difference, V.Acapacitance value is always positive.
1
This terminology is under the jurisdiction of ASTM Committee E37 on
The unit of capacitance is the farad, F, which is equivalent to one
ThermalMeasurementsandarethedirectresponsibilityofSubcommitteeE37.03on
coulomb per volt.
Nomenclature and Definitions.
Current edition approved Nov. 1, 2005. Published January 2006. Originally
Celsius—designation of the degree on the International Prac-
approved in 1988. Last previous edition approved in 2004 as E1142–04.
2 tical Temperature Scale; also used for the name of the scale,
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
as “Celsius Temperature Scale.” Formerly (prior to 1948)
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
called“Centigrade.”TheCelsiustemperaturescaleisrelated
the ASTM website.
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E1142–05
to the International Kelvin Temperature Scale by the equa- congruent transformation—an isothermal, or isobaric, phase
tion T =T − 273.16K, (1988). changeinwhichbothofthephasesconcernedhavethesame
c
Centigrade—see Celsius. composition throughout the process; the order of a system
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-
...