Determination of true values of the thermal conductivity of inert gases at atmospheric pressure and temperatures from the normal boiling point to 6000�K

1985 ◽  
Vol 49 (2) ◽  
pp. 942-950
Author(s):  
A. G. Shashkov ◽  
T. N. Abramenko ◽  
V. I. Aleinikova
Keyword(s):  
Thermal Conductivity ◽  
Atmospheric Pressure ◽  
Boiling Point ◽  
Inert Gases ◽  
Normal Boiling Point ◽  
True Values

Development of a general model for determination of thermal conductivity of liquid chemical compounds at atmospheric pressure

AIChE Journal ◽  
2012 ◽  
Vol 59 (5) ◽  
pp. 1702-1708 ◽  
Author(s):  
Farhad Gharagheizi ◽  
Poorandokht Ilani-Kashkouli ◽  
Mehdi Sattari ◽  
Amir H. Mohammadi ◽  
Deresh Ramjugernath ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Atmospheric Pressure ◽  
General Model ◽  
Chemical Compounds ◽  
Liquid Chemical

scholarly journals IX. On the use of the barometric thermometer for the determination relative heights

1846 ◽  
Vol 136 ◽  
pp. 121-132
Keyword(s):  
Sea Level ◽  
Atmospheric Pressure ◽  
Boiling Point ◽  
Royal Society ◽  
Barometric Pressure ◽  
Boiling Water ◽  
The Alps ◽  
The Law

Although the observation of the temperature of boiling water has been for some time, but not extensively, employed for the determination of relative heights, yet the only means which experiment has confirmed of reducing it to a measure of the atmospheric pressure as usually estimated by the height of an equiponderate column of mercury has, till very recently, been overlooked; and it may perhaps be owing to this circumstance that the instrument for making the requisite observations remains to have fully developed in it the advantages it undoubtedly possesses, in portability and strength of construction, over the fragile and easily deranged barometer. My attention having been called to this subject by a remark made by Professor Forbes in his interesting work on the Alps, to the effect that he had found the temperature of boiling water to decrease uniformly with the increase in height of the place of observation, and at the rate of one degree of Fahrenheit for every 550 feet of vertical ascent, I considered that it would be highly satisfactory to verify this result during an excursion over the Alps of Savoy and Piedmont which I then had in contemplation, and in the course of which I proposed to visit some localities at very considerable elevations above the sea level: and I was induced also to seek for some foundation for this very simple law. In prosecuting the latter inquiry, I soon found that, by assuming the truth of De Luc’s formula for the determination of the boiling-point from the barometric pressure, at all accessible heights, a corroboration of the law in question is at once arrived at. I have since found, by reference to a paper in Vol. xv. of the Transactions of the Royal Society of Edinburgh, that Professor Forbes had himself verified his original conjecture in the same manner.

scholarly journals Thermal Conductivity of Frozen Sediments Containing Self-Preserved Pore Gas Hydrates at Atmospheric Pressure: An Experimental Study

Geosciences ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 65 ◽  
Author(s):  
Evgeny Chuvilin ◽  
Boris Bukhanov
Keyword(s):  
Thermal Conductivity ◽  
Physical Properties ◽  
Gas Hydrates ◽  
Atmospheric Pressure ◽  
The Self ◽  
Needle Probe ◽  
Hydrate Saturation ◽  
The Difference ◽  
Hydrate Bearing Sediments

The paper presents the results of an experimental thermal conductivity study of frozen artificial and natural gas hydrate-bearing sediments at atmospheric pressure (0.1 MPa). Samples of hydrate-saturated sediments are highly stable and suitable for the determination of their physical properties, including thermal conductivity, due to the self-preservation of pore methane hydrate at negative temperatures. It is suggested to measure the thermal conductivity of frozen sediments containing self-preserved pore hydrates by a KD-2 needle probe which causes very little thermal impact on the samples. As shown by the special measurements of reference materials with known thermal conductivities, the values measured with the KD-2 probe are up to 20% underestimated and require the respective correction. Frozen hydrate-bearing sediments differ markedly in thermal conductivity from reference frozen samples of the same composition but free from pore hydrate. The difference depends on the physical properties of the sediments and on changes in their texture and structure associated with the self-preservation effect. Namely, it increases proportionally to the volumetric hydrate content, hydrate saturation, and the percentage of water converted to hydrate. Thermal conductivity is anisotropic in core samples of naturally frozen sediments that enclose visible ice-hydrate lenses and varies with the direction of measurements with respect to the lenses. Thermal conductivity measurements with the suggested method provide a reliable tool for detection of stable and relict gas hydrates in permafrost.

2. Note on the Determination of Heights, chiefly in the Interior of Continents, from Observations of Atmospheric Pressure

1869 ◽  
Vol 6 ◽  
pp. 465-472
Author(s):  
Alexander Buchan
Keyword(s):  
Sea Level ◽  
Atmospheric Pressure ◽  
Boiling Point ◽  
Great Distance ◽  
Close Approximation ◽  
Sea Level Pressure ◽  
Level Pressure ◽  
Meteorological Observations

The weight or pressure of the atmosphere is ascertained by the mercurial barometer, the aneroid, or from the temperature of the boiling point of water. The height of a hill is measured barometrically, from observations made simultaneously at its base and top, and the application of certain well-known formulæ. The height of a place at no great distance from another place whose height is known, and at which observations are made about the same time, may similarly be ascertained with a close approximation to the truth.But, with regard to places far from any place of known elevation, or from any place at which meteorological observations are made, it is plain that the height can only be computed by assuming a certain pressure as the sea-level pressure at that place.

Sign in / Sign up

Export Citation Format

Share Document