The response surface plot for rehydration ratio is shown
in Fig. 11. From ANOVA (Table 4) it can be concluded
that the rehydration ratio depends mainly on pressure level
while sample thickness and microwave power had less
effect. While the rehydration ratio is positively correlated
with microwave power that of system pressure is negatively
correlated. As the pressure level decreases, the rehydration
ratio increases, owing to the increased drying rate and
creation of pores that are induced by vacuum conditions