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ASTM E2071-21
Standard Practice for Calculating Heat of Vaporization or Sublimation from Vapor Pressure Data
NORMA vydaná dňa 1.3.2021
Informácie o norme:
Označenie normy: ASTM E2071-21
Dátum vydania normy: 1.3.2021
Kód tovaru: NS-1022195
Počet strán: 4
Približná hmotnosť: 12 g (0.03 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM E2071-21 :
This practice describes the calculation of the heat of vaporization of a liquid or the heat of sublimation of a solid from measured vapor pressure data. It is applicable to pure liquids, azeotropes, pure solids, and homogenous solid solutions over the temperature range for which the vapor pressure equation fitted to the measured data is applicable. Vapor pressure data shall be measured in accordance to the test methods and shall be correlated with the Antoine equation. The heat of vaporization or sublimation is computed at the desired temperature from the vapor-pressure temperature derivative from the fitted Antoine equation by use of the Clapeyron equation.
Keywords:
Antoine equation, Clausius-Clapeyron equation, enthalpy of sublimation, enthalpy of vaporization, Haggenmacher equation, heat of sublimation, heat of vaporization, vapor pressure,, ICS Number Code 27.040 (Gas and steam turbines. Steam engines)
Doplňujúce informácie
| 1. Scope | ||||||||||
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1.1?This practice describes the calculation of the heat of vaporization of a liquid or the heat of sublimation of a solid from measured vapor pressure data. It is applicable to pure liquids, azeotropes, pure solids, and homogenous solid solutions over the temperature range for which the vapor pressure equation fitted to the measured data is applicable. Note 1:?This practice is generally not applicable to liquid
mixtures. For a pure liquid or azeotrope, composition does not
change upon vaporization so that the integral heat of vaporization
is identical to the differential heat of vaporization.
Non-azeotropic liquid mixtures change composition upon vaporizing.
Heat of vaporization data computed from this practice for a liquid
mixture are valid only as an approximation to the mixture
differential heat of vaporization; it is not a valid approximation
to the mixture integral heat of vaporization.
1.2?The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3?This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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| 2. Referenced Documents | ||||||||||
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