The compressibility of xenon containing 0.14 mole percent of krypton has been measured from 16.65° (the critical temperature) to 300°C and over the density range 1 to 10 mole per liter. The constants of the Beattie-Bridgeman equation of state for the sample used and for pure xenon have been determined from these measurements. The constants for pure xenon are R=0.08206, A0=4.6715, a=0.03311, B0=0.07503, b=0, c=30.02×104 in units of normal atmos, liter per mole, and °K (T°K=t°C+273.13). The weight of one liter of Xe at a pressure of one standard atmosphere is calculated from its molecular weight (131.3) and the above parameters to be 5.897 g per liter at 0°C and 5.467 g per liter at 70°F.