ONE FORMULA, ONE ANSWER
Ideal mixture bubble-point pressure calculator
Calculate the total pressure at the onset of boiling in an ideal liquid solution from liquid composition and pure-component vapor pressures at a common temperature. Choose input units and calculate one value within the stated conditions.
Inputs
Calculations run in this browser. Scientific notation such as 1.2e-3 is supported. Do not group thousands.
Result
Total bubble-point pressure P
Enter values and select Calculate.
P = Σ(xᵢpᵢ*); Σxᵢ = 1
Assumptions
Required: all vapor pressures evaluated at the same temperature, ideal liquid and vapor phases, and vapor-liquid equilibrium. Excluded: activity-coefficient corrections, fugacity corrections and chemical reaction. A nonvolatile component may use zero vapor pressure. Liquid mole fractions must sum to 1; rounding differences up to 1e-10 are accepted and normalized. Enter liquid composition, rather than vapor composition.
Displayed values are floating-point approximations. Design safety factors and unprovided error contributions are not calculated.
Formula references and credits
NaNa Lab created the code, descriptions, icons and preview images. Text, figures and code from the linked references have not been reproduced.
Physical constants: NIST / CODATA 2022. The values of μ₀ and ε₀ are measured recommendations, not exact defining constants. Values and precision notes are in the source record.
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