Everyone buys water in the store and they know that bottles are different: glass and plastic, with small and large volumes. This is evidenced by the label. But even on identical bottles the designations differ  1 l, 1l, 1dm3. How different are these indicators, do they relate to each other and how many milliliters per liter?
How much is 1 liter of milliliters?
For measuring the amount of fluid in everyday life, a unit volume of 1 liter is widely used. In our country, the abbreviation l is used to designate it. The name of this unit comes from the Latin root litra, hence the international designation l or L. And although, as we said, it is widely used, it is not included in the International System of Units SI.
Since no one is going to refuse it, a nonsystem set of units was created for a liter and the same other values as one day or an hour. The use of offsystem units has no limitations along with the SI and the possibility of their use in all industries. Nevertheless, the ratio between the two systems is set. Thus, one cubic decimeter corresponds to one nonsystem liter according to the International System, that is, 1 l = 1 dm³ = 0.001 m³. In principle, the cubic system of measures is the basis for the designation of volume.
In our country, the volume of liquid is almost always represented by a liter. In addition, the extension parts are widely used, correlated with this unit:
 milliliter, ml or ml (1 × 10⁻³);
 microliter, μl or μl (1 × 10⁻⁶);
 nanol, nl or nl (1 × 10⁻⁹);
 picoliter, pl or pl (1 × 10⁻¹²).
These small, long parts are usually used for medical or pharmaceutical purposes, in cooking and in some technical fields. In medicine, when using a syringe, for example, there is a synonym for milliliter  the cube.
So what is a liter? This is the socalled aggregate of milliliters collected in one container: 1 liter = 1000 milliliters. Thus, in order to get milliliters from liters, you need to use a mathematical action  multiplication:
 Kml = Kl × 1000;
 Kml  the value that defines milliliters;
 Cl is the value that determines liters.
For example, in one tablespoon the volume, expressed in liters, is 0.075 l. To express this value in milliliters, you need 0.075 × 1000 = 75 ml.
If the question is as follows: 1 milliliter is how much in liters, then we make the inverse calculations. To do this, divide the value that defines milliliters by 1000:
Kl = Kml ÷ 1000. In our case, it turns out 1 ml ÷ 1000 = 1 × 10⁻³ = 0.001 l.
It is quite easy to convert liters to milliliters when the first are given by an integer. In this case, you just need to add 3 significant zeros to the right of the digit that defines the value of liters:
 3 L = 3000 ml or 27 L = 27000 ml.
If the liters are represented by decimal, then when recalculating it is necessary to move the comma 3 digits to the right, for example:
 0.006 L = 6 ml.
If the value contains liters after the decimal point of less than three digits, transferring it, simply add zeros to the right, like this:
 0.02 L = 020 ml, according to the rules of mathematics, insignificant zeros are not indicated and, accordingly, we get 20 ml.
Two more examples:
 0.4 l = 400 ml;
 2.5 L = 2500 ml.
When all values are expressed in liters, and the result must be presented in milliliters, then all actions should be performed in liters, and the final values should be indicated in milliliters. How to do this, you already know.
How many drops in one milliliter?
If a milliliter is a small amount of liquid that does not even fill a teaspoon, then the drop has an even smaller volume. If you put together 20 drops, then we get one milliliter:
 1 ml = 20 drops of liquid;
 1 teaspoon = 5 ml = 100 drops.
Usually, a drop as a unit for measuring volume is used for medical purposes for dispensing drugs in liquid form. For example, sedative drops of valerian or motherwort. The volume of such a unit of measurement in microscopic doses of water and alcohol is different and is:
 for water  from 0.03 to 0.05 ml;
 for alcohol  about 0.02 ml.
For pharmaceutical purposes, this ratio drops to milliliters:
 aqueous solutions: 1 drop = 0.05 ml, respectively, 10 drops = 0.5 ml;
 alcohol solutions: 1 drop = 0.025 ml, then 10 drops = 0.25 ml.
The table shows the ratio of drops and milliliters for aqueous and alcohol solutions, respectively.
Number of drops  Aqueous solution, ml  Alcohol solution, ml 
one  0.05  0.025 
2  0.1  0.05 
3  0.15  0.075 
four  0.2  0.1 
five  0.25  0.125 
6  0.3  0.15 
7  0.35
 0.175 
eight  0.4  0.2 
9  0.45  0.225 
ten  0.5  0.25 
eleven  0.55  0.275 
12  0.6  0.3 
13  0.65  0.325 
14  0.7  0.35

15  0.75  0.375 
sixteen  0.8  0.4 
17  0.85  0.425 
18  0.9  0.45 
nineteen  0.95  0.475 
20  1.0  0.5 
We hope the data will help you in practical application, and you can accurately determine, for example, how many drops will contain a glass of water.