Adsorption equilibrium moisture contents of mungbean were determined by standard gravimetric method at the temperature of 20, 30, 40 and 50 degrees C and the relative humidity range of 11-97%. The effects of temperature were found to be significant and all the isotherms were found sigmoid in shape. Five widely used three parameters sorption isotherms equations such as modified Henderson, modified Chung-Pfost, modified Oswin, modified Halsey and GAB were used to fit the experimental data. The modified Chung-Pfost and modified Oswin equations have the ability to describe well the EMC/ERH relationship selected range of the relative humidity and temperature. The modified Chung-Pfost equation is the most suitable in M = f(rh, T) form while the modified Oswin equation is the most suitable in rh = f(M, T) form. (c) 2005 Elsevier Ltd. All rights reserved.