Vapour Pressure: Vapour pressure is the pressure exerted by a vapour in equilibrium with its solid or liquid phase at a particular temperature. Vapour pressure increases with temperature and is a measure of volatility. Volatile material evaporates more readily than non-volatile material because it has a higher vapour pressure. If the vapour pressure of a liquid reaches that of the surrounding atmosphere bubbles of vapour will form in the liquid and the liquid will boil. Water at sea level (atmospheric pressure 100kPa) boils at 100 degrees C. This means that at 100 degrees C water has a vapour pressure of 100kPa. On top of Mount Everest the atmospheric pressure is about 26kPa. Water has a vapour pressure of 26kPa at 70 degrees C so it will boil at 70 degrees C on top of Mount Everest. So boiling point decreases with decreasing applied pressure. This principle is used in vacuum distillation.

Hallikainen 1354 Vapour Pressure

Optimise your process control

The Hallikainen Model 1354 Vapour Pressure Analyser is a completely automated process stream analyser.
Its fast response and minimal maintenance requirements put the 1354 at the forefront of your vapour pressure measurement needs.

Key Features

• Continuous Measurement
• No Moving Parts In Flow Path
• Venturi Technology
• Wide Ambient Range
• ATEX Certified