Tang 1 Hu = 10 dou, 1 dou = 10 L, 1 L = 10.

There are two kinds: big and small.

Size:1= 60000ml,1= 6000ml,1l = 600ml,1= 60ml.

Small: 1 = 20000ml, 1 = 2000ml, 1l = 200ml, 1 = 20ml.