Blenders can be used to chop, blend, puree, and liquify ingredients, as well as whip air into foods to create foams. For safety, blenders should always be unplugged before and after use, and the base should never be submerged in water. When blending, the lid must be securely covered and solids added before liquids to prevent splashing, leaving room in the container for the contents to blend properly. Blenders should not be touched or have objects inserted while in use, and hot liquids should never be blended.