General Science Thermos Bottle Me pey Padarth Ko Kuch Samay Tak Usi Tap Rakhne Ke Liye Uski diwaron Par Nimn Parat Lagai Jati Hai ?

थरमस बोतल में पेय पदार्थ को कुछ समय तक उसी ताप रखने के लिये उसकी दिवारों पर निम्न परत लगाई जाती है ? - The following layer is applied on the walls of the thermos bottle to keep the beverage at the same temperature for some time? - Thermos Bottle Me pey Padarth Ko Kuch Samay Tak Usi Tap Rakhne Ke Liye Uski diwaron Par Nimn Parat Lagai Jati Hai ? General Science in hindi,  Physics X - Kirne question answers in hindi pdf  Drishtigochar questions in hindi, Know About Infrared General Science online test General Science notes in hindi quiz book    Radio - Tarangein