20.4 The following data were gathered to determine the relation- ship between pressure and temperature of a fixed volume of 1 kg of nitrogen, The volume is 10 m. T. "C -40 0 40 120 160 p. N/m 0900 8100 9300 10,500 11700 12.900 Employ the ideal gas law pV = nRT to determine R on the basis of this data. Note that for the law. T must be expressed in kelvins. 80