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Calorimeter

About: Calorimeter is a research topic. Over the lifetime, 5878 publications have been published within this topic receiving 77157 citations.


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Journal ArticleDOI
10 Jul 1954-Nature
TL;DR: In this article, the heat of formation of carbon tetrafluoride was determined by von Wartenberg using a d.c. arc between a graphite rod and a quantity of potassium, filtered from oxide, contained in a nickel crucible.
Abstract: THE heat of formation of carbon tetrafluoride was determined by von Wartenberg1 by measurement of the heat of combustion of potassium in the gas to form potassium fluoride and carbon. We have repeated his work and made similar measurements for several other fully halogenated fluoro-compounds, for which previous experimental determinations were lacking. The general technique used was the same as that of von Wartenberg—in particular, the reaction chamber was of the same size and design as his, and the reaction was likewise initiated by striking a d.c. arc between a graphite rod and a quantity of potassium, filtered from oxide, contained in a nickel crucible. The ignition energy was, however, measured more reliably by recording the arc current and voltage simultaneously on a moving film by means of a double-beam oscillograph. The calorimeter was of the isothermally jacketed type, with kerosene as the calorimetric fluid, the heat capacity being determined electrically.

33 citations

Journal ArticleDOI
F. Bouquet1, Yuxing Wang1, Heribert Wilhelm1, Didier Jaccard1, Alain Junod1 
TL;DR: In this article, the authors developed a calorimeter that gives a qualitative picture of the specific heat of a sample under high pressure up to ≈10 GPa. The principle of AC-calorimetry was adapted to the conditions in a high pressure clamp.

33 citations

Journal ArticleDOI
TL;DR: In this paper, a quasi-isothermal graphite graphite calorimeter is described, which is characterized by a power-compensating measuring principle, and compared with the quasi-adiabatic method of operation.
Abstract: A quasi-isothermal method of operating an absorbed-dose graphite calorimeter is described in theory and practice. In contrast with the well-known quasi-adiabatic operation, which entails temperature increases during measurements, in the quasi-isothermal mode the temperatures of the different graphite bodies remain constant except for small temperature drifts throughout the measurement. This implies that the temperature dependence of the specific heat of the absorber and of the sensitivity of the temperature sensor influence the absorbed-dose determination significantly less. The method is characterized by a power-compensating measuring principle which is illustrated with a 3-body graphite calorimeter. Comparisons of the quasi-isothermal with the quasi-adiabatic method of operation showed good agreement.

33 citations

Journal ArticleDOI
TL;DR: In this paper, a flow calorimeter of the heat conduction type is described, which is capable of measuring the heat effect associated with the process of dissolving slightly soluble gases into water.
Abstract: A flow calorimeter of the heat conduction type is described, which is capable of measuring the heat effect associated with the process of dissolving slightly soluble gases into water. The calorimeter operates in a steady‐state mode. Gas, fed at constant rate, is dissolved in flowing water within a specially designed microcalorimeter cell and the power is determined for the process. Computer control of the gas flow is used for convenient establishment of steady states. The calorimeter is calibrated electrically with a precision of 0.2% for power levels of 150–450 μW. Reproducibility of successive measurements of heats of solution of oxygen are within 1%. Results are presented for the enthalpy change for the dissolution of oxygen gas into pure water at 25 °C.

33 citations

Journal ArticleDOI
TL;DR: In this paper, the performance of a liquid-argon ionization chamber, consisting of a set of eigthy 2 mm thick iron plates, is described, and a ratio of 1.2 for the electron-to-proton response is derived.

33 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20224
202193
2020142
2019113
2018150
2017160