The viscosity of nitrous oxide has been measured in the temperature range of 100 to 1000deg;C. A specially constructed transpiration apparatus of fused silica was used. Results at the lower temperatures show very close agreement with those of other workers, the viscosity behaving normally up to about 550deg;C, above which the thermal decomposition of nitrous oxide becomes significantly large. Experimental data on the viscosity of dissociating nitrous oxide at high temperatures up to 1000deg;C are discussed. Viscosity results for oxygen at temperatures higher than those previously reported (i.e., above 800deg;C) are also included. The molecular interaction parameters for both nitrous oxide and oxygen have been calculated in the higher temperature ranges.
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