Vapour pressure definition

Vapour pressure means the pressure created when a substance evaporates. This is the pressure of the vapour of the substance, at any given temperature, in equilibrium with its liquid or solid form. The higher the vapour pressure, the more the substance tends to evaporate.

Vapour pressure means the pressure above the surface of a liquid relative to zero pressure (absolute). Also called true vapour pressure.

Vapour pressure means the dry vapour pressure equivalent as determined using the American Society for Testing and Materials (ASTM International) Standard D5191 “Standard Test Method for Vapour Pressure of Petroleum Products (Mini Method)”.

Examples of Vapour pressure in a sentence

• Not determined.· Vapour pressure at 20 °C:23 hPa· Density:· Relative density· Vapour density· Evaporation rateNot determined.

• Not determined.· Vapour pressure at 20 °C:23 hPa· Density at 20 °C:· Relative density· Vapour density· Evaporation rate1 g/cm³Not determined.

• Vapour pressure Testing not relevant or not possible due to the nature of the product.

• Vapour pressure Testing not relevant or not possible due to nature of the product.

• Not determined.· Vapour pressure at 20 °C:23 hPa· Density:· Relative density· Vapour density· Evaporation rateNot determined Not determined.

• However, formation of explosive air/ vapour mixtures is possible.· Explosion limits: Lower:Upper: 3 Vol %17 Vol %· Vapour pressure at 20 °C:97 hPa· Density at 20 °C:· Relative density· Vapour density· Evaporation rate0.7822 g/cm³ Not determined.

• Not determined.∙ Vapour pressure at 20 °C:23 hPa∙ Density at 20 °C:∙ Relative density∙ Vapour density∙ Evaporation rate1 g/cm³Not determined.

• Vapour pressure Vapour density Relative density Solubility(ies)Partition coefficient: n-octanol/ water Not available.

• Vapour pressure Not relevant.Vapour density Not relevant.Relative density Not relevant.Solubility(ies) Not known.Partition coefficient Not known.

• Not determined.· Vapour pressure at 20 °C:23 hPa· Density:· Relative density· Vapour densityNot determined.

More Definitions of Vapour pressure

Vapour pressure means the pressure exerted by the gaseous form of a substance in equilibrium with its liquid or solid form;

Vapour pressure of petrol means the volatility of the petrol at 37.8 degrees Celsius measured:

Vapour pressure means vapour pressure at 38 degrees Celsius as determined by the Reid method;

Vapour pressure means the petrol's volatility at 37·8oC measured using ASTM D4953 Standard Test Method for Vapour Pressure of Gasoline and Gasoline-Oxygenate Blends (Dry Method) published by the American Society for Testing and Materials as in force from time to time.

Vapour pressure means the equilibrium pressure of the saturated vapour above the liquid, ex- pressed in MPa absolute at a specified temperature.