ICE CALORIMETER DETERMINATION OF ENTHALPY AND SPECIFIC HEAT OF ELEVEN ORGANOMETALLIC COMPOUNDS

1955 ◽  
Author(s):  
CHARLES LENCHITZ
Keyword(s):  
Specific Heat ◽  
Organometallic Compounds

The Determination of the Specific Heat of Heavy Mineral Oils

1920 ◽  
Vol 12 (9) ◽  
pp. 891-894 ◽  
Author(s):  
Herbert S. Bailey ◽  
Carlton B. Edwards
Keyword(s):  
Specific Heat ◽  
Heavy Mineral ◽  
Mineral Oils

Multivariate optimization of PTV-GC-MS method for simultaneous determination of organometallic compounds of mercury, lead and tin

2016 ◽  
Vol 8 (42) ◽  
pp. 7702-7710 ◽  
Author(s):  
C. Moscoso-Pérez ◽  
V. Fernández-González ◽  
J. Moreda-Piñeiro ◽  
P. López-Mahía ◽  
S. Muniategui-Lorenzo ◽  
...  
Keyword(s):  
Simultaneous Determination ◽  
Organometallic Compounds ◽  
Multivariate Optimization ◽  
Inexpensive Method ◽  
Trace Level ◽  
Trace Level Determination

A simple, rapid and inexpensive method using PTV-GC-MS was developed for the simultaneous trace level determination of organometallic compounds of mercury, lead and tin.

scholarly journals XVII. On the atomic weight of glucinum (Beryllium)

1883 ◽  
Vol 174 ◽  
pp. 601-613
Keyword(s):  
Specific Heat ◽  
Volatile Compound ◽  
Atomic Weight ◽  
Normal Number ◽  
Vapour Density ◽  
Atomic Heat ◽  
Lothar Meyer ◽  
Free Metal

I. Introductory. Ever since the discovery of glucinum by Vauquelin, in 1798, its atomic weight has been a disputed matter amongst chemists. Its discoverer considered that its oxide was a monoide, an opinion which was however strongly opposed by Berzelius, who wrote the oxide Gl 2 O 3 and the atomic weight 13⋅7 (O=16). The researches of Awdejew and Debrayt again turned the scale in favour of the earlier view, and as an atomic weight of 9⋅2 suited the properties of the metal in the tables of periodicy constructed by MM. Mendeleef and Lothar Meyer, this atomic weight has, up to quite recently, been generally accepted by chemists. As a welcome confirmation to this came a determination of the specific heat of the metal by Professor E. Reynolds, J who found that for its atomic heat to be near the normal number 6⋅0, its atomic weight must be 9⋅2 and not 13⋅8. Almost immediately afterwards a second determination of the specific heat was made by MM. Nilson and Petterson, who, however, obtained a result agreeing not with the lower atomic weight hut with the higher. The reasons for these conflicting opinions are to be found—first, in the anomalous position of glucinum among the elements; secondly, in the difficulties which surround the preparation of even small quantities of the free metal in a tolerably pure condition; and thirdly, in the fact that no volatile compound of glucinum is known of which the vapour density might be easily determined.

Specific heats of polymer powders by differential scanning calorimetry

1982 ◽  
Vol 60 (14) ◽  
pp. 1853-1856 ◽  
Author(s):  
Eva I. Vargha-Butler ◽  
A. Wilhelm Neumann ◽  
Hassan A. Hamza
Keyword(s):  
Differential Scanning Calorimetry ◽  
Specific Heat ◽  
Scanning Calorimetry ◽  
Temperature Range ◽  
Specific Heats ◽  
Powdered Form ◽  
Polymer Powders

The specific heats of five polymers were determined by differential scanning calorimetry (DSC) in the temperature range of 300 to 360 K. The measurements were performed with polymers in the form of films, powders, and granules to clarify whether or not DSC specific heat values are dependent on the diminution of the sample. It was found that the specific heats for the bulk and powdered form of the polymer samples are indistinguishable within the error limits, justifying the determination of specific heats of powders by means of DSC.

scholarly journals The determination of the specific heat of superheated steam by throttling and other experiments

1905 ◽  
Vol 76 (509) ◽  
pp. 185-205 ◽  
Keyword(s):  
Specific Heat ◽  
Atmospheric Pressure ◽  
Superheated Steam ◽  
Electrical Energy ◽  
Total Heat ◽  
Saturated Steam ◽  
External Work

In October, 1898, the author commenced experiments, having for their object the determination of the specific heat of superheated steam. At first an attempt was made to obtain this end by measuring the rise in temperature produced in a known quantity of steam by supplying a definite amount of heat in the form of electrical energy, but the experimental difficulties experienced in satisfactorily preventing radiation, in maintaining the rate of flow of steam uniform and in securing a steam supply sufficiently homogeneous and constant as to temperature, proved so great that the attempt on these lines was given up for a time, but returned to later. Then another method was adopted, that of allowing dry saturated steam to expand without doing external work, and observing the resulting change in temperature. This method had been used in preliminary experiments on this subject by Professor Ewing and Mr. Dunkerley, who found that the specific heat of superheated steam at atmospheric pressure, as deduced by this method from Regnault’s values of the "total heat,” was not a constant, as had been previously supposed, but increased with temperature.

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