You will need
  • - table of substance density.
There is an opinion that the weight of any liquid substance, the volume of which is is equal to one liter, corresponds to one kilogram. However, to verify this error, it is enough to recall one simple formula from the course of school physics: m = p * V, where m is the mass of the substance taken, p is its density, V is the volume. This formula clearly shows the direct dependence of the weight of the substance not only from its volume, but also from its density. Therefore, it is impossible to translate the volume of the substance into weight, more precisely - liters to kilograms, since this is absolutely different physical units . But it’s possible to find out how much substance fills a given volume.
For translation liters milk in kilograms find out its density. According to various sources, the density of milk varies depending on its content of water, fat, dry skim milk residue from 1027 to 1032 kg / m³.
To get the average density, add both values ​​and divide the resulting number by two. The average density of milk will be equal to 1029.5 kg / m³. Convert a liter of milk into cubic meters (tabular data: 1 liter = 0.001 m³).
When you substitute these values ​​p = 1029.5 kg / m³ and V = 0.001 m³ in the formula: m = p * V (m = 1029.5 kg / m³ * 0.001 m³), ​​get m = 1.0295 kg. That means one liter holds 1.0295 kg of milk.