Determination of the true thermal conductivities of helium and nitrogen at atmospheric pressure and temperatures from the normal boiling points to 6700�K

1985 ◽  
Vol 49 (1) ◽  
pp. 818-827 ◽  
Author(s):  
A. G. Shashkov ◽  
T. N. Abramenko ◽  
V. I. Aleinikova
Keyword(s):  
Atmospheric Pressure ◽  
Boiling Points ◽  
Thermal Conductivities

EBULLIOMETRY AND THE DETERMINATION OF THE MOLECULAR WEIGHTS OF POLYMERS: PART III. CONSIDERATIONS ON THERMISTOR WHEATSTONE BRIDGES

1959 ◽  
Vol 37 (12) ◽  
pp. 1365-1373 ◽  
Author(s):  
W. R. Blackmore
Keyword(s):  
Atmospheric Pressure ◽  
Background Noise ◽  
Wheatstone Bridge ◽  
Thermistor Bridge ◽  
Molecular Weights ◽  
Boiling Points ◽  
Pure Solvent ◽  
Unbalance Voltage

It is shown that a d-c. thermistor Wheatstone bridge may be used in ebulliometry to measure the small temperature differences which are observed between the boiling points of polymer solutions and the pure solvent. A relationship is derived between the thermistor bridge unbalance voltage and the solute molecular weight, which it is desired to measure. It is shown that a bridge composed of suitably matched thermistors may be made independent of the gross changes in boiling point of both solution and solvent produced by changes in atmospheric pressure. The possibility of the current flowing through the thermistors disturbing the measurements is discussed and in situ measurements of thermistor dissipation and time constants are given. The sensitivity attainable with various thermistor bridges and modern amplifiers at full gain is calculated and shown to be much greater than may be employed with the usual type of ebulliometer. The reason for this is the relatively large background noise (random temperature fluctuations) produced in the ebulliometer by the boiling process itself.

Determination of thermal conductivities of solid and liquid phases for rich-Sn compositions of Sn-Mg alloy

2012 ◽  
Vol 18 (1) ◽  
pp. 77-85 ◽  
Author(s):  
Fatma Meydaneri ◽  
Mehmet Gündüz ◽  
Mehmet Özdemir ◽  
Buket Saatçi
Keyword(s):  
Mg Alloy ◽  
Liquid Phases ◽  
Thermal Conductivities

The determination of normal boiling points at high altitudes

1957 ◽  
Vol 34 (9) ◽  
pp. 440 ◽  
Author(s):  
Luis Levy ◽  
Oswaldo E. Proano
Keyword(s):  
High Altitudes ◽  
Boiling Points
Sign in / Sign up

Export Citation Format

Share Document