The bulk density, which considers expansion in all directions, is an index of the extent of puffing. Bulk density is greatly affected by process variables during frying. Higher oil temperature significantly decreases the density; especially at short frying time as shown in Fig. 1(b). At long frying time, the temperature is less effective. This is in agreement with the finding of Maneerote et al. (2009) the bulk density of fried rice crackers mixed with fish powder decreased with increase in frying temperature and changed slightly with increase in frying time at all frying temperatures.