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.
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.