What this boiling point calculator tells you
This boiling point calculator turns the values for this specific relationship into an answer with visible substitutions and units. Choose water, ethanol, or acetone, enter the external pressure, and select its unit. The accepted pressure range updates to match the selected substance and correlation.
The result answers only the selected boiling point question. It uses the model and assumptions stated on this page together with the values and choices shown in the form. Record any reference state or convention required by your course before comparing the answer with a textbook or data table.
Formula and unit check for boiling point
The page shows the working expression IAPWS-IF97 Region 4 Ts(p) for water, or log₁₀(P/bar) = A − B/(T + C) for ethanol and acetone. Pressure is converted to bar. Water is then solved with the IAPWS-IF97 saturation equation; ethanol and acetone use a NIST Antoine set only when the solved temperature lies inside its published interval. Overlapping valid sets are evaluated separately, not interpolated.
Read the displayed substitution from left to right and confirm that each input appears once in the role named by the formula. If the units or sign do not lead to the requested quantity, correct the setup instead of trusting a plausible-looking decimal.
Work through a boiling point example
For a representative classroom example, IAPWS-IF97 gives ordinary water about 99.9743 °C at 1.01325 bar, while the selected organic-liquid correlation uses its own bounded interval. The calculator keeps the substituted values visible so you can compare the sign, scale, and rounding with your own work. Try changing one input at a time: the direction of the change should agree with the formula, while the other assumptions remain fixed.
When a result surprises you, repeat the arithmetic with the displayed intermediate value, then reread the active fields described above. A different mode, sign, unit, or model assumption can change the conclusion even when the arithmetic itself is correct.
How to interpret the result
The answer is the temperature at which the selected pure substance has the entered vapor pressure. It is not a boiling prediction for a mixture, solution, or sealed system.
Keep significant figures appropriate to the measurements and constants. Do not report ten meaningful digits just because the calculator can display them. For a formal assignment, cite the data source or convention required by the course. For a practical decision, confirm the result with a validated property table, instrument, or qualified professional.
Scope, limitations, and private use
Water is limited to the IAPWS saturation-pressure range; ethanol and acetone are limited to their named NIST Antoine temperature intervals. If two ethanol correlations are both valid, the tool reports both estimates as a range instead of hiding their disagreement. The page is intended for learning, checking homework, and routine estimates. It does not provide a safety limit, operating procedure, regulatory conclusion, or guarantee that a real sample follows an ideal model.
The values are calculated in the current browser tab. NexaCurrent does not upload the quantities, formulas, chemical names, element choices, or other information entered here, and no account is needed. Copying is a deliberate action after the answer and working are visible. Refreshing or leaving the page clears the current calculation, so keep a copied result if it is needed for later study.