How many arrows are equal to 2 liters of iron arrowheads in Song Dynasty

The concept of liter is volume, a liter of rice is about four pounds. The modern liter is consistent with the liter, which is about 1L, and appears to be much smaller than the ancient liter.

According to the metal working ability at that time, I guess the Jin army would not use too big iron arrow, each can be as big as a walnut, right, two liters is less than a hundred arrows.

But the traditional Chinese culture is not sensitive to the numbers, talk a lot of bragging rights, and there was no gasoline at that time, it is very difficult to completely incinerate the body.