unchanged by the medium at 4 l m ton wet coal and increased by the medium at 8 and 12 l m ton wet coal example 14 indicates that the density of wet coal containing 10 moisture was increased by the medium at all concentrations tested example 15 indicates that the density of wet coal containing 15 moisture was increased by the medium at all concentrations tested in both the polyethylene oxide and polyacrylamide tests the smaller the amount of moisture added the larger the bulk density drop in the polyethylene oxide tests best results were obtained with both 0 1 and 0 2 by weight solutions and wet coal of 15 moisture by weight in the polyacrylamide tests best results were obtained with both 0 1 and 0 2 by weight aqueous solutions with wet coal of 15 by weight moisture the lower concentration of medium is preferred because of less use of polymer polyacrylamide is slightly more effective than polyethylene oxide in terms of bulk density recovery it will be apparent to those skilled in the art that the examples and embodiments described herein are by way of illustration and not of limitation and that other examples may be utilized without departing from the spirit and scope of the present invention as set forth in the appended claims table 1______________________________________effect on coal bulk density of the addition of diesel fueladditive in the presence of various amounts of surface moisture surface bulk moisture additive density normalizedexample by weight 1 m ton lb cu ft bulk density______________________________________1 0 0 51 52 1 00 5 0 41 34.