There is a buildup of pressure inside the product due to the increasing product temperature. The pressure increase was greater for samples with higher moisture content. During the frying stage itself, the gage pressure attained negative magnitudes. The drop in pressure to the negative values may act as a driving mechanism for the uptake of oil before the product is taken outside the fryer. The constant negative values of pressure during the cooling period are expected to result in the further absorption of oil from the surface to the core.