water vapor pressure calculator
Calculate Vapor Pressure
About Vapor Pressure
Vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid or solid phase. It's a fundamental property that depends on temperature and the nature of the substance.
Antoine Equation:
log₁₀(P) = A - B/(C + T)
Clausius-Clapeyron:
ln(P/P₀) = -(ΔH_vap/R) × (1/T - 1/T₀)
Raoult's Law:
P = x × P°
Where:
- P = Vapor pressure
- T = Temperature (°C)
- A, B, C = Antoine constants
- ΔH_vap = Enthalpy of vaporization
- x = Mole fraction
Factors Affecting Vapor Pressure:
• Temperature (exponential relationship)
• Intermolecular forces
• Molecular size
• Surface area
Applications:
• Distillation design
• Evaporation processes
• Atmospheric science
• Chemical engineering
Understanding vapor pressure is essential for process design, environmental modeling, and predicting phase behavior.