Plastic cups refer to disposable containers for drinks and tea. It belongs to non-degradable products and is the main source of "white pollution". Generally, breakfast porridge shops will provide all kinds of take-away drinks in plastic cups and use them on site. Among them, plastic cups have different sizes, depending on the situation, the conventional volumes are 200 ml, 250 ml, 280 ml and 300 ml. Generally, the density of porridge is close to that of water, so the weight of porridge is as many grams as it is filled.