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Rates of oxidation of uranium have been measured volumetrically at constant pressure in the temperature range 125°–250°C and at oxygen pressures from 20 to 800 mm. The oxidation is best described by two linear rate laws, a marked increase in rate occurring after an average of 50 µg O2/cm2 has been consumed. The first stage rate in µg/cm2‐min is given by the expression v1=1.48×104 P1/n e−E/RT where E=10,700 normalcal , P is oxygen pressure in millimeters of mercury, and 1/n varies with temperature. The reaction is believed to be controlled by process occurring at the gas‐oxide surface. The increase in rate leading to the second stage is not treated quantitatively, but is attributed to a net increase in surface area.

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