Video narration
Kal ka bacha khana adrishya tarangon se garam kaise hota hai? Microwave vidyut-chumbakiya tarangein hain - garmi nahin, urja le jaane wali adrishya laharein. Khane ke paani ke anu badalte vidyut asar se urja sokhte hain; wahi garmi banti hai. Oven garmi nahin bhejta; khana microwave urja sokhta hai. Isliye khana sirf andar se nahin, har jagah barabar bhi nahin garam hota. Hilane ya ghumane se garmi phailti hai. To kal ka bacha khana adrishya urja sokhkar garam hota hai.