Ideal Binary Bubble and Dew Pressure Calculator
Calculate bubble or dew pressure and incipient opposite-phase composition for a two-component ideal mixture.
YOUR CALCULATION
Result
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Calculation steps
Work through one step at a time or reveal the complete calculation. The steps use your current inputs.
How to calculate
Apply Raoult’s law and ideal-gas vapor composition at the one entered temperature.
Bubble P=Σxi Pi,sat with yi=xi Pi,sat/P; dew P=1/Σ(yi/Pi,sat) with xi=yi P/Pi,sat
Worked example
At liquid x1=0.5 and saturation pressures 100/40 kPa, bubble pressure is 70 kPa and incipient vapor y1=5/7.
Assumptions and input details
Binary ideal liquid and ideal vapor, common temperature and supplied pure-component saturation pressures. No activity/fugacity coefficients, azeotropes, temperature root search or actual process-design assessment.
Unit definitions
Unit selection is independent of language. Each selector contains only units for its physical quantity. Calculations use defined base units internally.
Using this calculator
Can I enter my own problem?
Yes. Replace the example values with your own inputs. The result, calculation steps, tables and applicable diagrams update from those inputs. Blank or invalid values clear the result; example values are never silently substituted for missing inputs.
Are the results exact?
Results use floating-point arithmetic and displayed rounding. Read the formula, assumptions and any stated data precision before interpreting the result.
Is my input uploaded?
The calculation runs in your browser. No account, file upload or external AI service is required. Inputs are not saved between page reloads.
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