During the frying process, the moisture in rice crackers changed to vapor due to heat.
The vapor evaporated from the rice crackers and created an overpressure inside the pores. As a result, the frying oil was not able to penetrate into the pores during frying.
When the fried rice crackers were removed from the frying oil, the pore temperature inside rice crackers dropped and the vapor in the crust condensed.
The overpressure turned into under pressure, while the oil adhered to the surface of the rice crackers. Therefore, the oil was driven into the pores (Mellema, 2003; Saguy & Dana, 2003).
In another study, more than 80 g/100 g of the oil in potato chips was absorbed after the food was removed from the oil (Ufheil & Escher, 1996).