The rate of diffusion of oxygen through grain

The rates of diffusion of oxygen through bulk wheat, maize, barley and oats have been determined. In wheat the mean rate at 23d̀ is 0.067 mg./sec. and a temperature dependence has been demonstrated. In maize, barley and oats the mean rates at room temperatures are 0.0558, 0.0642 and 0.0721 respectively. The volumes of the intergranular air space of the four grains have been determined.