The thermal conductivity lambda and heat capacity per unit volume of poly(propylene glycol) PPG (0.4 and 4.0 kg.mol-1 in number-average molecular weight) have been measured in the temperature range 150-295 K at pressures up to 2 GPa using the transient hot-wire method. At 295 K and atmospheric pressure, lambda = 0.147 W m(-1)K(-1) for PPG (0.4 kg.mol(-1)) and lambda = 0.151 W m(-1)K(-1) for PPG (4.0 kg.mol(-1)). The temperature dependence of lambda is less than 4 x 10(-4) W m(-1)K(-2) for both molecular weights. The bulk modulus has been measured in the temperature range 215-295 K up to 1.1 GPa. At atmospheric pressure, the room temperature bulk moduli are 1.97 GPa for PPG(0.4 kg.mol(-1)) and 1.75 GPa for PPG (4.0 kg.mol(-1)). These data were used to calculate the volume dependence of lambda, g = -(partial derivative lambda/lambda/partial derivative V/V)(T). At room temperature and atmospheric pressure (liquid phase) we find g = 2.79 for PPG (0.4 kg.mol(-1)) and g = 2.15 for PPG (4.0 kg.mol(-1)). The volume dependence of g, (partial derivative g/partial derivative log V)(T) varies between -19 to -10 for both molecular weights. Under isochoric conditions, g is nearly independent of temperature. The difference in g between the glassy state and liquid phase is small and just outside the inaccuracy of g of about 8%. The theoretical model for lambda by Horrocks and McLaughlin yields an overestimate of g by up to 120%.