In this work, a series of bubble-point measurements were carried out on the binary system butane + decane. The experiments were carried out using the Cailletet apparatus, and bubble-point pressures were measured in a temperature range of (323.21 to 482.28) K. The corresponding pressures were predicted using the Peng-Robinson equation of state, and the relative errors were estimated. It is shown that this hydrocarbon mixture can be predicted reasonably well by this equation of state.