Where can I find Antoine constants?
They are available in chemistry handbooks (like NIST) for thousands of substances. Ensure the units match (mmHg vs bar, °C vs K).
Calculator
Enter your values
Default constants are for Water (0-60°C).
Results
Pressure (mmHg)
23.69
Pressure (kPa)
3.16
Analysis
Interpretation of the current calculator output
Calculation Summary
The current inputs have been processed for the vapor pressure calculator. Review the results panel for the computed output and use the charts tab to compare the current values visually.
How to Read It
The main result shows the direct answer for your current inputs. Supporting sections below explain the method, example, and common questions so the result is easier to interpret.
How to Use
Step-by-step instructions
- 1Enter the temperature in Celsius.
- 2Enter the Antoine constants (A, B, C) for the substance.
- 3Defaults are for Water (0-60°C).
- 4The calculator will compute the vapor pressure.
Antoine Equation
Describes the relation between vapor pressure and temperature for pure components.
log₁₀(P) = A - (B / (C + T))Variables:
PVapor pressure (mmHg)TTemperature (°C)A, B, CSubstance-specific constantsExample
Water at 100°C
Inputs:
T:100
A:8.07131
B:1730.63
C:233.426
Steps:
- 1.log P = 8.07 - (1730 / (233 + 100))
- 2.log P ≈ 2.88
- 3.P = 10^2.88 ≈ 760 mmHg
Result:
760 mmHg (1 atm)