2. When milk and cola precipitate, a chemical reaction will occur, which is called protein denaturation. The main component of milk is protein, which will appear liquid when the pH is appropriate, while cola is acidic, so it will precipitate when it meets milk.
3. Fresh milk is a compound emulsion composed of water, fat, protein, lactose, minerals, vitamins, etc., in which the water content accounts for 86%~90%, so its nutritional components are relatively low compared with other foods.