you need
• calculator table density substances, pharmacy scales
Guide
1
Translation milligrams per milliliter is made, as a rule, for liquid and dry (drugs, chemicals)substances.To put the number in the number of milligrams of milliliters, multiply milligrams on the density of matter and divide by 1000. The density, thus, it should be represented in grams per liter (g / l).In a formula is as follows:
KML = EP x ρ / 1000 where:
KML - the number of milliliters of substance,

KMG - the number of milligrams of the substance,

ρ - density of substance in g / l.
2
To find the density of matter, use special tables density substances.Note that the density they had before in grams per liter.If the density of matter is given in other units, then bring her in grams per liter.For example, if the density in the table will be expressed in kilograms per liter, then its transfer in grams per liter, multiply this number by 1000. If the density is given in kilograms per cubic meter, then nothing needs to translate - numerical values ​​of the density in g / lkg / m³ coincide.
3
To convert milligrams per milliliter of a mass of water or a very weak solution, simply divide the number of milligrams of 1000. That is, use a simplified version of the above formula:
KML = EP / 1000.
The same formula can beused for evaluating an amount of milliliters of fluid corresponding to the predetermined number of milligrams.Especially in those cases where the fluid density is not known, and much calculation accuracy is not required.

In assessing the volume of solids using this, an approximate formula should be more cautious, since the density of solids varies considerably greater extent.
4
If the density of matter is unknown and there is no possibility to use tables of density, determine the density of matter on their own.To do this, pour or pour into a measuring cup some amount of substance, and then weigh it.Then divide the weight of the substance (in grams) by its volume (in liters).If there is no measuring cups, use any standard containers - bottles, cans, glass, spoon.As a rule, the majority of household utensils has a known volume.

to measure very small volumes of liquid, use the medical syringe, and to determine the mass - Take pharmacy scales.