Adsorption-desorption behaviours of bori nuggets prepared front black gram pulse were studied at different relative humidity (ERH) ranging from 0% and 85% and temperatures at 25, 35, 45 and 55 degreesC following the static equilibriation technique using the saturated solutions of various salts. These data were analysed and fitted Guggenheirn-Anderson-de Boer (GAB) sorption model. The temperature dependence of the respective coefficients revealed that the GAB model is acceptable (r(2) greater than or equal to 0.99; M-RES less than or equal to 0.481) in describing the EMC-ERH relationships of the nuggets. The M-0, C and K values were in the rantle of 8.35-8.24, 82.28-41.04 and 0.74-0.72 for adsorption. The corresponding values for desorption are 9.52-8.77, 107.83-39.68 and 0.74-0.73. The net isosteric heats of sorption estimated from the Clausius-Clapeyron equation, decreased exponentially from 5.94 to 2.52 kJ mol(-1) with the increase in moisture content of the sample 5-24% (db) for adsorption. The corresponding values were 8.42 to 3.42 kJ mol(-1) for desorption. (C) 2004 Elsevier Ltd. All rights reserved.