Vapor Pressure Converter

Convert between different units of vapor pressure including Pascal, bar, atmosphere, mmHg, psi, and more. Essential for chemical engineering, meteorology, and thermodynamic calculations.

Base Unit: 1 Pa = 0.001 kPa = 0.000001 MPa = 0.00001 bar = 0.01 mbar = 9.86923×10⁻⁶ atm = 0.00750062 Torr = 0.0002953 inHg = 0.00750062 mmHg = 0.000145038 psi = 1.0197×10⁻⁵ kgf/cm²

About This Vapor Pressure Converter

Our Vapor Pressure Converter provides precise conversions between different units used to measure vapor pressure in various scientific and engineering applications. Vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid or solid phase at a given temperature, making it crucial for understanding phase transitions and chemical processes.

The converter uses exact conversion factors based on international standards, ensuring accurate results for chemical engineering calculations, meteorological studies, and thermodynamic analysis. All conversions are derived from the base SI unit of Pascal (Pa).

Key Features

Comprehensive Units

Convert between 11 different vapor pressure units including SI, metric, imperial, and specialized measurements used across industries.

Scientific Precision

Handles both very low vapor pressures and high-pressure scenarios with automatic scientific notation for extreme values.

Real-time Conversion

See results instantly as you type or change units, perfect for quick calculations during experiments or design work.

Industry Standards

Uses conversion factors aligned with chemical engineering, meteorology, and thermodynamics standards worldwide.

Why Choose Our Converter?

  • Accuracy: Uses precise conversion factors from international pressure standards
  • Versatility: Covers medical, industrial, and scientific pressure measurements
  • User-Friendly: Intuitive interface designed for professionals and students
  • Mobile-Ready: Responsive design works perfectly on all devices
  • No Installation: Web-based tool accessible from any browser

Frequently Asked Questions

What is vapor pressure?

Vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid or solid phase at a given temperature. It indicates how readily a substance evaporates and is crucial for understanding boiling points, distillation, and phase transitions.

When would I use different pressure units?

Pascal (Pa) is the SI standard for scientific work, bar is common in engineering, mmHg/Torr is used in medical and vacuum applications, psi is standard in American industry, and atmosphere (atm) is convenient for comparing to standard atmospheric pressure.

What’s the difference between Torr and mmHg?

Torr and mmHg are essentially identical units (1 Torr = 1 mmHg = 133.322 Pa). Torr is named after Evangelista Torricelli and is commonly used in vacuum applications, while mmHg is often used in medical and meteorological contexts.

How does temperature affect vapor pressure?

Vapor pressure increases exponentially with temperature according to the Clausius-Clapeyron equation. Higher temperatures provide more energy for molecules to escape the liquid phase, resulting in higher vapor pressure.

What are typical vapor pressure values?

Water at 20°C: ~2.3 kPa; Ethanol at 20°C: ~5.9 kPa; Mercury at 20°C: ~0.0002 Pa; High-volatility solvents can have vapor pressures of 10-100 kPa at room temperature, while low-volatility substances may have vapor pressures below 1 Pa.