1939
DOI: 10.6028/jres.023.008
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Measurements of heat capacity and heat of vaporization of water in the range 0 degrees to 100 degrees C

Abstract: The present series of measurements of heat capacity and heat of vaporization of water in the range 0° to 100° C have been made to provide greater certainty in the values of the specific heat of water for calorimetric purposes and also to provide greater reliability in the values of enthalpy and the other derived propert ies for use in st eam tables.. To insure the desired accuracy in the specific-heat determinations, complete new calorimetric equipment was designed and built. The same fundamental principles of… Show more

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Cited by 280 publications
(171 citation statements)
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“…One series was made with th e conLainer mostly full of water, while the oLber series was made with a small amount of water. The results of the experiment compare very favorably with the results of the earlier work [9] with an adiabatic calorimeter. The average heat capacity from 0° to 250° 0, a measured with the present apparatu , is about 0.02 percent lower tban that measured with the earlier apparaLus, with a reproducibili ty of about ± 0.02 percent.…”
Section: Resultssupporting
confidence: 80%
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“…One series was made with th e conLainer mostly full of water, while the oLber series was made with a small amount of water. The results of the experiment compare very favorably with the results of the earlier work [9] with an adiabatic calorimeter. The average heat capacity from 0° to 250° 0, a measured with the present apparatu , is about 0.02 percent lower tban that measured with the earlier apparaLus, with a reproducibili ty of about ± 0.02 percent.…”
Section: Resultssupporting
confidence: 80%
“…At 25° 0 the reproducibility of the pre ent apparatus was relatively poor, giving a value of about ± 0.14 percent for t he average deviation of the mean. In spite of this, the measured average heat capacity from 0° to 25° 0 was only abou t 0.05 percent lower th an the accepted accurate value [9].…”
Section: Resultsmentioning
confidence: 95%
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“…In the first place, as pointed out later in this paper (section 5 and figure 8), the heatcapacity values calculated from eq (2) arc slightly higher in the temperature region of overlap than the somewhat more accurate values determined with the low-temperature adiabatic calorimeter. A maximum difference of approximately 0.25 percent occurs at about 50° C, but has deCl'eased to approximately 0.1 percent at 100° C. In the second place, over-all checks on the accuracy of the furnace and ice calorimeter, described elsewhere [2], were carried out by measuring the mean heat capacity of water between 0° and 25° C and between 0° and 250° C. These results arc lower by 0.05 ± 0.14 percent and by 0.02 ± 0.02 percent, respectively, than the corresponding results obtained earlier at this Bureau of use of two precise adiabatic calorimeters [13,22].…”
Section: Reliability and Comparison Of Thecontrasting
confidence: 47%