Function ethanolWaterDensityKgPerL

Density of an ethanol and water mixture, kilograms per litre.

ρ = Σ A_k p^(k−1) + Σ B_k (t − 20)^k + Σ Σ C_ik p^k (t − 20)^i
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p is the mass fraction of ethanol, from 0 to 1, and t the temperature in °C. This is the polynomial from OIML R 22, the International Alcoholometric Tables, which is what printed spirit tables and alcoholmeters are built from. It is fitted from −20 to 40 °C. It gives 0.99820 for water and 0.78924 for ethanol at 20 °C.

Sugar or anything else dissolved in the liquid is outside it.