To solve this problem, we must first understand two concepts. The first is what fart is, and the second is what makes you feel warm. Regarding the first question, Baidu Google sogou 360 Search Bing can answer you; Here, I posted 59% nitrogen, 2 1% hydrogen, 9% carbon dioxide, 7% methane and 4% oxygen that I found. As for the second question, there is a warm feeling in the quilt because the quilt, as a covering, retains the heat generated and emitted by the human body itself. So the gas in the first question can't generate and release heat by itself, so farting in the bed can't warm the bed. Although we think the fart looks hot, it's only because the temperature of the digestive tract in your body is higher than that outside, so the gas that just overflowed from your body will certainly feel hot, but the fart itself will not generate new heat to make your bed warmer. However, under normal circumstances, there are only two options for people to fart under the bed, one is under the bed and the other is outside the bed. Needless to say, in the first case, but in the second case, there will be a movement to lift the bed. After this action, the air inside and outside the bed will be exchanged and the stored heat will be lost. The cold air outside will enter the bed, so putting fart outside the bed will lose some heat. So our conclusion is that farting outside the bed will make the bed cold, but farting in bed will not. ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ I drew the dividing line ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~