Rigorous % v/v dilution for ethanol and isopropanol. Ethanol uses the OIML R22
Wagenbreth-Blanke polynomial (−20 °C to +40 °C). Isopropanol uses a 45-term bivariate
polynomial ρ(p, t) fitted by least squares to International Critical Tables Vol. 3 (1928),
valid 15–40 °C. Volume contraction is implicitly handled via mixture densities throughout.
IPA polynomial range: 15–40 °C only. This calculator replaces the Perry
table lookup for isopropanol with an 8th-degree/4th-degree bivariate polynomial
(max residual 0.58 kg/m³, RMS 0.15 kg/m³). The polynomial is fitted directly
to International Critical Tables Vol. 3 (1928), pp. 120–121 — the primary source
from which Perry's Handbook itself derives its IPA data. Reference and ambient temperatures
for IPA are restricted to 15–40 °C. Use the original calculator for IPA at 0 °C.
01 — Alcohol type
02 — Known quantity
03 — Concentrated alcohol properties
98.0%
04 — Target concentration & ambient temperature
Results reported at this temperature (15–40 °C for IPA polynomial)
Results
▶ Calculation trace
Version 1.1 — Last updated: 6 April 2026 — IPA polynomial refitted directly to ICT Vol. 3 (1928) primary source (corrected Perry transcription errors); max residual 0.59 kg/m³, RMS 0.15 kg/m³ (15–40 °C).