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Dep. of Agronomy and Soils, Washington State Univ., Pullman, 99164
ICRISAT-Centre Sahelien, B.P. 12404, Niamey, Niger
* Corresponding author.
ABSTRACT
Temperature rise, measured a short distance from a line heat source, can be used to determine the volumetric specific heat of soil and other materials. Volumetric specific heat is linearly related to the inverse of the temperature rise. The purpose of this note is to describe the construction and performance of a device for measuring specific heat using the line source method. The device was constructed from two hypodermic needles, 0.813 mm in diam. and 28 mm long, and spaced 6 mm apart. One needle contained a heater and the other a thermocouple. The temperature rise from heat pulses given to the heater were measured with the thermocouple. The coefficientof variation (CV) of specific heat on replicate samples was around 1%. Since water is the main variable component of the specific heat in nonswelling soil, changes in water content might be resolved to 0.01 or better in nonswelling soils.
Contribution from the Dep. of Agronomy and Soils, Washington State Univ., Agric. Res. Cnt. and ICRISAT.
Received for publication March 12, 1990.
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