100mg/2ml or 250mg/2ml
200mL equates to 2dL (deciliters).
nothing
If you have 2ml, you have 2/3785 gallons, or about 0.00053 gallons. (US Fluid)
mg is a measure of weight therefore there may be any number of mg in 2 ml e.g. if I were to dissolve 5mg of salt in 2ml of water there would be 5mg in 2ml. However I could dissolve 10mg of salt in 2ml of water then there would be 10mg in 2ml. 2ml of WATER weighs 2g
2ml
One deciliter is 100mL
2ml
Depends on the density.
.5mg
2ml/g
5ml