2. Among all the cups, the glass cup is the healthiest and safest, because it contains no organic chemical components, but the glass cup is not uncertain, because it is made of inorganic substances, which makes the heat conductivity of the cup very good.
3, aluminum is only light, so it can be used for outdoor equipment, not too hot for too long. Generally speaking, acidic juice can be packed in aluminum cups. For example, the cola we drink is made of aluminum, but it has an anticorrosive coating inside.