The basic condition for the distillation is that the equilibrated steam and the liquid phase have a different composition than the liquid phase. If the vapor and liquid phase compositions are different, there is not sufficient separation in the distillation process.

Distillation is a method generally used for purifying and separating organic compounds. If more heat is applied to a liquid reaching the boiling point, the temperature of the liquid does not increase, but the liquid begins to turn into vapor. Using this method, two liquids with different vapor pressures can be separated. Distillation types are classified according to various parameters.

The aim of the determination of alcohol by volume is to measure the amount of alcohol contained in various beverages such as beer, wine, raki, wixi, brandy, gin or vodka, or non-alcoholic beverages and fruit juices gravimetrically. Gravimetric analyzes are based on the separation and weighing of a desired substance (alcohol here) from the sample (here beverage) as a pure compound or in the elemental state. The separation process is very difficult to form a precipitate which dissolves. This method is based on measuring the weight or weight differences of the substance and calculating the quantity of substance sought using this information. Gravimeter measurements consist of the following steps: precipitation, ripening, filtration, washing, drying and glow and finally weighing.

Determination of alcohol content, Distillation of alcohol obtained by distillation is determined based on the principle of determining the alcohol content by determining the density of the pycnometer.

In the accredited laboratories, determination of alcohol content by distillation is carried out within the scope of chemical tests and the standards prepared by domestic and foreign organizations and test methods and test criteria accepted worldwide are followed. In these laboratories, more reliable and objective service is provided with these studies and their reports are accepted all over the world.