Ethanol density6/24/2023 This results in book-sized publications like the Practical Alcohol Tables or else partial tables like the American TTB Tables which give full accuracy at only one temperature and then require correction factors to be applied for other temperatures. The disadvantage of tables of density data is that huge tables are required to cover the practical ranges of temperatures, concentrations and ethanol densities with sufficient accuracy. A table allows the ethanol density data to be given with much greater precision than when shown in a graph. A small excerpt from such a table is shown below. This non-linearity is the reason for the inaccuracy of simple proportion-based methods for ethanol blending calculations (eg Pearson's Square).Īnother alternative for presenting ethanol density data is to use a table. Plotting a graph makes the non-linear relationship between ethanol density and strength obvious. Multiple temperatures can be accommodated by drawing more than one curve on each graph, but this results in interpolation being required for values between the displayed temperatures. Also, each graph can only display the data in one unit of measurement (eg kg/m³) and for one type of concentration. Unless the graph is very big it is impossible to read the data accurately. Unfortunately the graphical method of representing the ethanol density has several disadvantages. The non-linearity is not obvious when using a computer program or tabulated data to determine the ethanol density, even though the density vs composition behavior is accurately represented. This non-linearity is caused by the shrinkage that occurs when ethanol and water are mixed. It is immediately clear from the graph below that the relationship between the mixture composition, expressed in %ABV terms, and the ethanol density is not linear. An advantage of using a graphical representation is that the "big picture" behavior is seen very easily. The relationship between ethanol density and strength can also be shown on a graph (see below). Click on the "Home" option in the menu above to get more details on AlcoDens and to download a free trial copy. It can calculate the density for a known strength, or determine the strength for a known density. This screenshot shows the AlcoDens ethanol density calculator in action. All of these options are included in AlcoDens, which makes it possible to convert between these different strength options as well as determining the density over the full strength range from 0% to 100% (0 to 200 Proof). The most usual methods are alcohol percentage by volume (%ABV), alcohol percentage by mass (%Mass), molar percentage and alcohol proof. The strength or concentration of an ethanol-water mixture can be expressed in several different ways. if you know the strength you can work back to the ethanol density. AlcoDens can also be used in reverse mode, i.e. If the ethanol density is known in any of these units AlcoDens can be used to determine the strength of the ethanol-water mixture over the range of temperatures from -20☌ to 100☌ (-4☏ to 212☏). This allows the density to be calculated as a function of both the strength and temperature of the mixture.Ī computer program can work with ethanol density in many different units of measurement, and AlcoDens includes kg/m³, g/cm³, kg/liter, g/liter, lb/ft³, lb/US gallon, lb/Imp gallon and SG relative to water at 60☏. The most flexible, powerful and accurate method is to use an ethanol density calculator application like AlcoDens. Next screenshot Ethanol Density Calculatorĭata for the density of ethanol-water mixtures is very widely used in industry and several methods of storing and presenting this data are used, each with its own advantages and disadvantages.
0 Comments
Leave a Reply. |