Tablespoon (Metric)
The metric tablespoon is a cooking unit equal to 15 milliliters. Introduced to simplify cooking and nutrition measurements in metric countries, it differs slightly from the US tablespoon (≈14.7868 mL). Metric tablespoons are widely used in recipes, labeling, and culinary schools, providing precise, repeatable 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.