Abstract
A THERMISTOR is a resistance body which has a high negative temperature coefficient of resistance, and is a valuable circuit element with a large variety of applications. Thermistors can be used as sensitive thermometers in cryoscopic measurements1 and also in place of thermocouples for measuring the lowering of vapour pressure of aqueous colloidal solutions2. At a condition of steady state, the droplets of solution and solvent deposited on the tips of the thermistors have a constant difference in temperature which can be measured as a difference of resistance in an A.C. bridge circuit. The construction and operation of a simple A.C. thermistor bridge, used for measuring the osmotic activities of aqueous solutions, has been described by McGee and Iyengar (submitted for publication elsewhere).
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References
Zeffert, B. M., and Hormats, S., Anal. Chem., 21, 1420 (1949).
Brady, A. P., Huff, H., and McBain, J. W., J. Phys. Coll. Chem., 55, 304 (1951).
Taylor, G. B., and Hall, M. B., Anal. Chem., 23, 945 (1951).
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KULKARNI, S. Molecular Weight Determination by Thermistors. Nature 171, 219–220 (1953). https://doi.org/10.1038/171219b0
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DOI: https://doi.org/10.1038/171219b0
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