Since the foil wraps around the food, the main directions it conducts heat don't matter. One of the great myths about aluminum foil is that when baking with it, you always put the shiny surface of the aluminum foil on the inside and the dull surface on the outside. The reflective surface will reflect heat and the matte side will absorb heat. The reflective surface will reflect heat and the matte side will reflect less heat . The surface of the aluminum layer that is in contact with atmosphere oxidizes and turns into aluminum oxide — hence the matte side. The effect of trhe aluminum foil on the cooling depends on details. The heat flow is at right angles to the foil surface. Which side of aluminum foil reflects more heat? Which side of aluminum foil keeps heat in? In this case, we can use both side of the foil. Aluminum foil is actually made of two layers: one of aluminum, another that is coating. Which side of aluminum foil keeps heat in? The shielding of the radiation by the foil should help reduce the heat flow.
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