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Standard Test Method for Relative Molecular Mass (Molecular Weight) of Hydrocarbons by Thermoelectric Measurement of Vapor Pressure
Automaticky přeložený název:
Standardní zkušební metoda pro relativní molekulové hmotnosti (molekulová hmotnost) uhlovodíků získaná termoelektrický měření tlak par
NORMA vydána dne 15.4.2012
Označení normy: ASTM D2503-92(2012)
Poznámka: NEPLATNÁ
Datum vydání normy: 15.4.2012
Kód zboží: NS-20565
Počet stran: 3
Přibližná hmotnost: 9 g (0.02 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
hydrocarbons, molecular weight, osmometer, relative molecular mass, thermoelectric measurement, vapor pressure, Hydrocarbons, Molecular weight, Relative molecular mass, Vapor pressure (VPx)--petroleum products, ICS Number Code 75.080 (Petroleum products in general)
Significance and Use |
Relative molecular mass (molecular weight) is a fundamental physical constant that can be used in conjunction with other physical properties to characterize pure hydrocarbons and their mixtures. A knowledge of the relative molecular mass (molecular weight) is required for the application of a number of correlative methods that are useful in determining the gross composition of the heavier fractions of petroleum. |
1. Scope |
1.1 This test method covers the determination of the average relative molecular mass (molecular weight) of hydrocarbon oils. It can be applied to petroleum fractions with molecular weights (relative molecular mass) up to 3000; however, the precision of this test method has not been established above 800 molecular weight (relative molecular mass). This test method should not be applied to oils having initial boiling points lower than 220°C. 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 and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, 5.2.1, 5.2.3, and 5.2.3. |
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