Summary: Generally speaking, the fog surface is easy to absorb heat, therefore, the fog surface must face light and heat to play an effective role. For example, when barbecuing, the food should be wrapped in tin foil, so that the fog faces the charcoal fire, so that the meat is easy to cook; If the sun visor is made of tin foil paper, the light surface will face the light source, which will refract light and heat, and it will be cooler. Generally speaking, the fog surface absorbs heat easily, so the fog surface should face light and heat to play an effective role. For example, when barbecuing, the food should be wrapped in tin foil, so that the fog faces the charcoal fire, so that the meat is easy to cook; If the sun visor is made of tin foil paper, the light surface will face the light source, which will refract light and heat, and it will be cooler.