During post-frying cooling no vigorous escape of vapor took place at the surface and pressure drop inside the product may be due to the condensation of water vapor. This may cause pressure driven flow of oil from the outer layer of food to the inner layer. The pressure driven flow and the capillary flow together cause the rapid uptake of oil (Halder et al., 2007). Vacuum produced by the steam condensation at the evaporation front during cooling phase reduces the capillary flowof oil into the food (Gamble & Rice,1988). In the present experiments, the maximum pressure created inside the chicken nuggets during frying was 0.18 kPa. These results did not match with the predictions of Yamsaengsung and Moreira (2002b) who predicted a pressure of 284 kPa inside tortilla chips during frying. Such high pressures would blow up the fried product, as noted by Halder et al. (2007).