A modius is an ancient Roman unit of measurement used primarily for dry volume, particularly for grains. It is equivalent to about 8.75 liters or 2.3 gallons. The modius was commonly used in trade and agriculture to quantify the amount of produce, such as wheat or barley, being sold or stored. In addition to its practical use, the modius also had cultural significance in Roman society. It was often depicted in art and literature, symbolizing abundance and the importance of agriculture in sustaining the population. The term is sometimes referenced in discussions about ancient Roman life and economy, highlighting the importance of agriculture in that era.