In previous papers1,2), we have studied the cooking-rate equations on the microwave heated cooking of potato slices. In order to design various microwave heating apparatuses, it is necessary to measure the absorbed energy and the increased temperature of microwave heated foodstuffs. In this paper, the values of the increased temperature of liquid samples during microwave heating in an electronic range were observed, and the values of the absorption efficiency were calculated by using a simple energy equation formed by authors. The temperature of water in a small vessel in a large vessel contained salad oil was measured. The value was very large same as a small vessel contained water was set up only in the electronic range. This phenomena observed are very interesting for the microwave frying of foodstuffs.