Because a melon seed is about 0.2-0.25g, 1 ton is equal to 1 000kg, 1 ton/0.25g = 4 million, 1 ton/0.2g = 5 million. The average method that can be adopted is to weigh 100 melon seeds with the same size and then divide by 100. A melon seed is about 0.2-0.25g..

The unit conversion is as follows.

1 1,000 ng = 1 ug, 1 1,000 ug =1mg,11,000 mg =/kloc-0.

Ton is one of the units of mass. 1 ton is 1000 kg, specifically the weight of 1 m3 of water at standard atmospheric pressure and 4 degrees Celsius. The unit of volume is equal to 100 cubic foot-also known as "registered ton". Unit of volume, usually 40 cubic feet, is also called "loaded ton". Cooling effect of melting. Mathematical unit, lowercase t.