A coiled quartz tubular reactor has been designed to measure the intrinsic reaction kinetics for homogeneous reactions at high temperatures up to 1100degreesC. Actual gas residence times were less than 100 ms. A simple and well-studied test reaction (i.e., the decomposition of nitrous oxide, N2O), with published intrinsic kinetics, was used to verify the operation of the experimental reactor. For this system, Peclet numbers (Pe = uL/D-L) computed from experimental conversion data were greater. than 1000, indicating that the plug flow assumption could be used with this reactor system to determine intrinsic rate expressions with errors of less than 5% for the conditions studied.