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.
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Vapour pressure means the pressure above the surface of a liquid relative to zero pressure (absolute). Also called true vapour pressure.
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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)”.
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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;
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Vapour pressure of petrol means the volatility of the petrol at 37.8 degrees Celsius measured:
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Vapour pressure means vapour pressure at 38 degrees Celsius as determined by the Reid method;
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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.
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Vapour pressure means the equilibrium pressure of the saturated vapour above the liquid, ex- pressed in MPa absolute at a specified temperature.
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Related to Vapour pressure

  • Reid vapor pressure means the vapor pressure of crude oil or other volatile petroleum products at 100 degrees Fahrenheit as determined by the latest edition of ASTM D6377 (RVPE): Standard Test Method for Determination of Vapor Pressure of Crude Oil.

  • True vapor pressure means the equilibrium partial pressure exerted by a petroleum liquid as determined in accordance with methods described in American Petroleum Institute (API) Bulletin 2517, Evaporation Loss from External Floating Roof Tanks, 1980. The API procedure may not be applicable to some high viscosity or high pour crudes. Available estimates of true vapor pressure may be used in special cases such as these.

  • Backpressure means a pressure (caused by a pump, elevated tank or piping, boiler, or other means) on the consumer's side of the service connection that is greater than the pressure provided by the public water system and which may cause backflow.

  • Pressure means the total load or force per unit area acting on a surface.

  • Low water pressure means water pressure below the regulatory reference level which is the minimum pressure when demand on the system is not abnormal.

  • Operating pressure means the pressure at which the parts of an irrigation system are designed by the manufacturer to operate.

  • Working pressure means the settled pressure of a compressed gas at a reference temperature of 15 °C in a full pressure receptacle;

  • Pressure vessel means containers for the containment of pressure, either internal or external. This pressure may be obtained from an external source or by the application of heat from a direct or indirect source, or any combination thereof.

  • Vapor tight means equipment that allows no loss of vapors. Compliance with vapor-tight requirements can be determined by checking to ensure that the concentration at a potential leak source is not equal to or greater than 100 percent of the lower explosive limit (LEL) when measured with a combustible gas detector, calibrated with propane, at a distance of 1 inch (2.54 cm) from the source.

  • Diatomaceous earth filtration means a process resulting in substantial particulate removal in which a precoat cake of diatomaceous earth filter media is deposited on a support membrane (septum), and while the water is filtered by passing through the cake on the septum, additional filter media known as body feed is continuously added to the feed water to maintain the permeability of the filter cake.

  • Biomass means the biodegradable fraction of products, waste and residues from biological origin from agriculture (including vegetal and animal substances), forestry and related industries including fisheries and aquaculture, as well as the biodegradable fraction of industrial and municipal waste;

  • Design pressure means the hydrostatic pressure for which each structure or appliance assumed watertight in the intact and damage stability calculations is designed to withstand.

  • Carbon dioxide or “CO2” means the most common of the six primary greenhouse gases, consisting on a molecular level of a single carbon atom and two oxygen atoms.

  • Atmosphere means the air that envelops or surrounds the earth and includes all space outside of buildings, stacks or exterior ducts.

  • Positive pressure respirator means a respirator in which the pressure inside the respiratory inlet covering exceeds the ambient air pressure outside the respirator.

  • CO2 means carbon dioxide.

  • Nitrogen oxides means nitric oxide and nitrogen dioxide, expressed as nitrogen dioxide (NO2);

  • Feedstock Gas means natural gas used as a raw material for its chemical properties in creating an end product.

  • Cubic foot of gas means the amount of gas required to fill a cubic foot of space when the gas is at an absolute pressure of fourteen and seventy-three hundredths (14.73) pounds per square inch at a temperature of sixty (60) degrees Fahrenheit.

  • Psig means pounds per square inch gauge.

  • Electrostatic spray means a method of applying a spray coating in which opposite electric charges are applied to the substrate and the coating. The coating is attracted to the substrate by the electrostatic potential between them.

  • Output means the exposure rate, dose rate, or a quantity related in a known manner to these rates from a brachytherapy source or a teletherapy, remote afterloader, or gamma stereotactic radiosurgery unit for a specified set of exposure conditions.

  • Invasive plant species means species of plants not historically found in California that spread outside cultivated areas and can damage environmental or economic resources. Invasive species may be regulated by county agricultural agencies as noxious species. Lists of invasive plants are maintained at the California Invasive Plant Inventory and USDA invasive and noxious weeds database.

  • Ultra Low Sulfur Diesel Fuel means diesel fuel that has a sulfur content of no more than fifteen parts per

  • tons means the gross tonnage calculated in accordance with the tonnage measurement regulations contained in Annex I of the International Convention on Tonnage Measurement of Ships, 1969; the word “tonnage” shall be construed accordingly.

  • Finished water means the water that is introduced into the distribution system of a public water system and is intended for distribution and consumption without further treatment, except as treatment necessary to maintain water quality in the distribution system (e.g., booster disinfection, addition of corrosion control chemicals).