Fluid Ounce (US) (fl oz)
The US fluid ounce, symbol fl oz, measures approximately 29.5735 milliliters. Its origins trace back to the British Imperial fluid ounce but were standardized differently in the United States. It is used for liquids in cooking, beverages, and nutrition. Fluid ounces bridge smaller units, such as teaspoons and tablespoons, with larger units, including cups, pints, and gallons, providing flexibility and precision in culinary measurements.
Gallon (US)
The US gallon, symbol gal, equals 4 quarts, 8 pints, or 128 fluid ounces (~3.785 liters). Its origins trace to English wine and ale measures but were standardized in the US in the 19th century. Gallons are used for beverages, fuel, and large-volume recipes. While metric liters are the dominant unit of measurement in most countries, gallons remain widely used in the United States for everyday and industrial liquid measurements.