Elektrische Leitf�higkeit verschiedener Mischungen von Quecksilberisotopen

Jaeger, W.; Steinwehr, H. v.

doi:10.1007/bf01332781

Cited by 10 publications

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“…PREVIOUS WORK Results of measurements of the heat of combustion of benzoic acid by various observers [2,3,20,21,22,23,32] are given in table 10. The correction of the 1934 results of Jessup and Green is discussed in section V of this paper.…”

Section: Procedures For Correcting Results Reported On the Basis Omentioning

confidence: 99%

“…An additional correction of about 1 jig has been applied to the values of QB at 25° C attributed in the 1934 report to Fischer and Wrede [20], Wrede [2]], Roth, Doepke, and Banse [22], and Jaeger and von Stein wehr [23] to take account of the temperature dependence of the Washburn reduction, an effect which was partially neglected in the 1934 report.…”

Section: Procedures For Correcting Results Reported On the Basis Omentioning

confidence: 99%

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Heat of combustion of benzoic acid, with special reference to the standardization of bomb calorimeters

Jessup¹

1942

J. RES. NATL. BUR. STAN.

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New measurements y ielded the value 26428 .4± 2.6 Inte rnational joules per gram mass for thc heat of combustion, QB, of benzoic acid at 25° C under the conditions of the standard bomb process. The difference, 0.036 percent, between the above value and that reported in 1934 is due to five factors : (1) An error in the previous value, resulting from the effect of dissolved carbon dioxide on the determin ation of the nitric acid formed in t he bomb, (2) a change in the value used for the energy of formation of nitric acid in the bomb, (3) taking account in the present work (in the calculation of the value of QB at 25° from the observed value at 30°) of the temperature dependence of the Washburn reduction, (4) a change in the value used for the tempe rature coefficient of the heat of combustion, arising from the use of a new value tor the specific heat of benzoic acid, and (5) a smaJl difference in the results of the calorimetric measurements. The 1934 resul ts, when corrected for tile first four of the above effects, are in agreement within 0.01 percent with the results of the present measurement~. The procedure for correcting the results of calibration experiments originally calculated on the ba~is of the 1934 value of OB i5 described.With one exception, values of OB at 25° C calculated from the results of previous

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Section: Procedures For Correcting Results Reported On the Basis Omentioning

confidence: 99%

Section: Procedures For Correcting Results Reported On the Basis Omentioning

confidence: 99%

Heat of combustion of benzoic acid, with special reference to the standardization of bomb calorimeters

Jessup¹

1942

J. RES. NATL. BUR. STAN.

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“…The calorimetric apparatus for measuring the heats of chemical reactions of the third class, those occurring at constant volume in a closed bomb, is well standardized, and a detailed description of the modern apparatus and technic is given in a number of papers (11,17,18,19,27,37,38,42). While the bomb calorimeter is susceptible of very high precision, approaching 0.01 per cent in some cases, two points in connection with the accuracy of the thermochemical values obtained should be noted.…”

Section: Thermochemical Calorimetry and Thermometrymentioning

confidence: 99%