With this calculator it is very easy to try out with two sliders, the effect of %abv in the boiler and the number of theoretical plates on the volatilities of aroma compounds.
If you move the cursor over an congeners name without pressing (or tap on it with a touchscreen), other names and also further information about this congener will be displayed.
The congeners are sorted within their group (e.g. "esters") according to their molar mass. So at the top is the smallest ester (ethyl acetate) and at the bottom is the largest (ethyl caprinate) of which we have data. Generalizing, within a group of congeners, the larger molecules are the ones with the better aroma or the ones from which the more interesting aromas can be created.
The absolute volatility can be given in two ways:
- The volatility mol / mol is the scientific one. It is the quotient of the mole fraction of the congener in the current distillate and the mole fraction of the congener in the boiler.
- More practical, however, is the volatility gr/lt / gr/lt. It is the quotient of the gr/lt of the congener in the current distillate and the gr/lt of the congener in the boiler.
Often volatility data is presented in comparison to the volatility of ethanol. This is much more interesting in practice than the absolute volatility, since it is decisive for the aroma strength of the distillate diluted to drinking strength at the end. This comparative volatility is shown here in the second column of the tables.
In three of the five congener groups, there is an additional column with a representation relative to a substance other than ethanol. These values allow conclusions to be drawn about the quality of the aroma.

More information about congeners and calculation examples
Information about our boiling point data