A liquid ounce is a unit of volume commonly used in the United States to measure liquids. It is equivalent to approximately 29.57 milliliters. Liquid ounces are often used in cooking, beverage serving sizes, and nutrition labels to indicate the amount of liquid in a container. In the United States, liquid ounces are different from dry ounces, which measure weight. The abbreviation for liquid ounce is "fl oz." This measurement is important for recipes and food packaging, ensuring accurate portion sizes and consistency in liquid measurements across various products and recipes.