However, too high microwave power drying has also been associated with physical damages to the products, e.g. scorching, over-heating or charring, and uneven temperature distribution. Such physical damages are the result of continuous local temperature rising even though the loss factor of material being dried decreases with reduction in moisture contents. This also indicates a possible non-uniform distribution of microwaves inside the cavity. Hence it is difficult to control the quality of the dried products when higher power densities are used.