A cocktail glass is a stemmed glass which has a cone-shaped bowl placed upon a stem above a flat base. It is mainly used to serve cocktails. Its form derives from the fact that all cocktails are traditionally served chilled and contain an aromatic element. Thus, the stem allows the drinker to hold the glass without affecting the temperature of the drink, and the wide bowl places the surface of the drink directly under the drinker's nose, ensuring that the aromatic element has the desired effect. A standard cocktail glass contains 4.5 US fluid ounces (13.3 cl).