Daqin Shenji

It's beautiful and interesting.

One cubic decimeter, that is, the mass of one liter of water is one kilogram. In this way, to determine the volume of many irregular objects, you only need to throw it into the water, and then weigh the object by the weight of the water displaced by the object. You can know the volume/capacity of the object without conversion. In this respect, the metric system is more conducive to industrialization in setting standards.