It is known that for a certain second-order, elementary, gasphase reaction (first order in A, first order in B), the rate of reaction increases by 50% when the temperature goes from 250°C to 280°C. In a laboratory setup, a plug flow reactor operates at essentially isothermal conditions (250°C) and at an operating pressure of 20 atm. For a fixed inlet flowrate (equal molar flows of A and B in the feed with no inerts), the measured conversion of A is 57%.