Speaking of capacity, its explosion is actually because the official standard container has gotten a little bit bigger. For example, a standard container cast in the previous dynasty was ten centimeters long, ten centimeters wide, and ten centimeters deep, with an actual volume of one thousand milliliters; when recasting in the present dynasty, as long as the length, width and depth were increased by three centimeters, the actual volume would be It became 2,197 milliliters. The dimensions of the container have expanded only a little, but the capacity has grown exponentially.
In short, the scale company banner design expanded slowly because the government was worried about the protests of the people; the weight and capacity expanded rapidly because it was difficult for the people to notice the little changes in the scales and containers. The capacity increased sharply in the Northern Dynasties and was confirmed by the Sui and Tang Dynasties, and since then it has become the standard of the Song Dynasty. During the two-song and three-hundred years, most emperors were gentle, courteous, courteous, and kind, and the exploitation of the common people was not particularly excessive.
Therefore, when Song Dynasty people read Tang Dynasty poetry and prose, they can fully understand Tang Dynasty prices by using the capacity commonly used in their lives. For example, Song Zhenzong invited hundreds of officials and asked about the price of wine in the Tang Dynasty. Minister Ding Wei replied: "One liter of wine in the Tang Dynasty sold for thirty copper coins." Song Zhenzong asked Ding Wei what evidence he had, and Ding Wei said, "I have read Du Fu's poem, 'Drinking a bucket of wine in the morning is exactly the same as that. Three hundred bronze coins.” A dou is ten liters, and a dou sells for 300 wen, and a liter naturally sells for 30 wen.” Song Zhenzong was very happy when he heard this.