An Erlenmeyer flask, also known as a conical flask, is a type of laboratory flask with a flat bottom, a conical body, and a cylindrical neck. It is typically made of glass or plastic and is used to mix, heat, and store chemicals and other solutions. Graduated Erlenmeyer flasks have measurement markings on the side, usually in milliliters (mL) or ounces (fl oz) to indicate the volume of liquid inside the flask. This allows for precise measurements of the contents of the flask.