Vapor Pressure Calculator

Real-Time Thermodynamics Tool

Live Calculation

Updated: Just now

Vapor Pressure Calculator

REAL-TIME

Calculate vapor pressure for chemicals using the Antoine equation. Input temperature and select a chemical to get real-time results.

-50°C 25°C 300°C
A: 8.07131 B: 1730.63 C: 233.426

log10(P) = A - B / (C + T)

Where P is in mmHg and T is in °C

Vapor Pressure Result

Vapor Pressure (Pvap)

23.76 mmHg

Equivalent in Different Units

0.0317 bar
3.17 kPa
0.46 psi
0.0313 atm

Selected Chemical

Water (H₂O)

Calculation Details

log₁₀(P) = 8.07131 - 1730.63 / (233.426 + 25) = 1.3759 → P = 10^1.3759 = 23.76 mmHg

Temperature vs. Vapor Pressure

Understanding Vapor Pressure: A Complete Guide

Vapor pressure is a crucial thermodynamic property that determines the pressure exerted by a vapor in equilibrium with its liquid or solid phase at a given temperature.

How to Use This Vapor Pressure Calculator

Our real-time vapor pressure calculator makes it easy to determine the Pvap of various chemicals:

  1. Select a chemical from the list or use the search function to find a specific compound
  2. Adjust the temperature using the input field, slider, or temperature unit selector
  3. View real-time results in multiple pressure units (mmHg, bar, kPa, psi, atm)
  4. Save calculations for future reference or compare different chemicals
  5. Analyze the chart to understand how vapor pressure changes with temperature

What is the Antoine Equation?

The Antoine equation is a semi-empirical correlation that describes the relation between vapor pressure and temperature for pure substances:

log₁₀(P) = A - B / (C + T)

Where:

  • P is the vapor pressure (typically in mmHg)
  • T is the temperature (in °C)
  • A, B, C are substance-specific Antoine coefficients

Applications of Vapor Pressure Calculations

Vapor pressure calculations are essential in various fields:

  • Chemical Engineering: Design of distillation columns, evaporators, and reactors
  • Environmental Science: Understanding volatile organic compound (VOC) emissions
  • Pharmaceuticals: Drug formulation and stability testing
  • Food Industry: Freeze-drying and dehydration processes
  • Meteorology: Humidity and precipitation calculations

Why Use Our Real-Time Vapor Pressure Calculator?

Our tool offers several advantages over traditional calculation methods:

  • Instant Results: Calculations update in real-time as you change inputs
  • Comprehensive Database: Access to 100+ chemicals with verified Antoine parameters
  • Multiple Units: Convert between mmHg, bar, kPa, psi, and atm effortlessly
  • Visualization: Graphical representation of temperature-pressure relationship
  • Accuracy: Uses validated Antoine coefficients from reliable sources
Pro Tip: For accurate results, ensure the temperature is within the valid range for the selected chemical's Antoine parameters. Most parameters are validated for specific temperature ranges.

Whether you're a student, engineer, or researcher, this vapor pressure calculator provides a reliable and efficient way to determine Pvap values for your thermodynamic calculations.

Saved Calculations

Your recent vapor pressure calculations

No saved calculations yet.
Perform a calculation and click "Save Result".

Unit Converter

Converted Value: 0.0317
bar

Chemical Properties

Select a chemical to view properties

Temperature Presets

Common temperature values for quick selection