At the solution of physical and chemical tasks sometimes it is required to transfer milligrams to milliliters. Though it is absolutely different units of measure, such converting usually does not cause difficulties. It is only enough to know density of this substance or its name. In most cases a transfer of milligrams to milliliters is made for water or for very weak solutions. In this case it is much simpler to transfer milligrams to milliliters.

## It is required to you

- calculator, table of density of substances, pharmaceutical scales

## Instruction

1. A transfer of milligrams to milliliters is made, as a rule, for liquid and loose (drugs, chemical reactants) substances. To transfer the number of milligrams to quantity of milliliters, increase milligrams by density of substance and divide for 1000. Density, at the same time, has to be presented in grams on liter (g/l). In the form of a formula it looks as follows: Kml = Kmg x ρ/1000, where: Kml – quantity of milliliters of substance, Kmg - the number of milligrams of substance, ρ – substance density in g/l.

2. To learn substance density, use special tables of density of substances. Pay attention that density in them was presented in grams on liter. If density of substances is set in other units, then bring it into grams on liters. For example, if density is expressed in the table in grams increase this number for 1000 by liters. If density is set in kilograms on cubic meter, then it is necessary to transfer nothing – numerical values of density to g/l and in kg/m³ coincide.

3. To transfer from milligrams to milliliters some mass of water or very weak solution, just divide the number of milligrams for 1000. That is use the simplified option of the above-stated formula: Kml = Kmg / 1000. The same formula can be used for approximate assessment of the quantity of milliliters of liquid corresponding to the set number of milligrams. Especially when density of liquid is unknown, and the big accuracy of calculations is not required. At assessment of volumes of loose substances to use this, approximate, a formula follows with bigger care as density of solid substances fluctuates in much big limits.

4. If density of substance is unknown and there is no opportunity to use tables of density, then determine substance density independently. For this purpose pour or fill some volume of substance in a measured mug, and then weigh it. Then divide the mass of substance (in grams) into its volume (in liters). If there is no measured mug, use any standard container – a bottle, a can, a glass, a spoon. As a rule, the majority of household ware has the known volume. To measure very small volumes of liquid, use the medical syringe, and for determination of weight – take pharmaceutical scales.