Various physical properties have been studied in different extruded products.
Jyothi et al. (2009)
studied the physical properties including bulk density, true density, porosity, and expansion ratio; water absorption index, water solubility index, oil absorption index, in the single extruder to process tuber starch.
Rocha- Guzman et al. (2008)
studied water absorption index (WAI), water absorption capacity (WAC), oil absorption capacity (OAC), and emulsifying capacity (EC) in the extrusion process of bean cultivars flour. }Ozer, _Ibanoglu,
Ainsworth, and Yagmur (2004)
studied the physical properties (bulk density, expansion, and porosity) of a nutritionally balanced extruded snack food by the RSM method. The influence of process variables on physical properties have been shown to be generally significant in all these
studies.
Table 2 also provides some data on the resultin