The amount of mass of a vapor per unit volume of the vapor.
The density of a material's vapor compared to the density of the air.
The weight of a vapor or gas compared to the weight of an equal volume of air is an expression of the density of the vapor or gas. Materials lighter than air have vapor densities less than 1.0. Some examples are acetylene, methane, hydrogen. Materials heavier than air, such as propane, hydrogen sulfide, ethane, butane, chlorine, and sulfur dioxide, have vapor densities greater than 1.0. All vapors and gases will mix with air, but the lighter materials will tend to rise and dissipate unless confined. Heavier vapors and gases are likely to concentrate in low places-along or under floors, in sumps, sewers, and manholes, in trenches and ditches where they may create fire or health hazards.
Volumetric mass of a gaseous element.
the ratio of the formula mass of the compound to the average formula mass of the gases in air. This formula ratio is correct for a pure gas at room temperature. However, this ratio does not accurately express the vapor density of a liquid solvent.
A measure of how heavy the vapor of a liquid is, compared to air which has a vapor density of 1.0. When the vapor density is high, the vapors will tend to collect in low spots.
the density of a gas relative to the density of hydrogen
Measurement of the relative density of a vapor compared with air. A vapor density of less than 1 indicates a vapor that is lighter than air. A vapor density that is more than 1 indicates a vapor that is heavier than air.
the density of a vapor compared to the density of an equal amount of air. Back
The weight of a gas or vapor compared with air.
Measure of a vapor's weight compared to air. (Gases and vapors which are lighter than air tend to rise while those that are heavier than air tend to sink.)
Vapor Density is the relative density or weight of a vapor or gas compared with an equal volume of air. If the vapor density of a substance is less than one, it will tend to rise in air; if the vapor density is greater than one, it will fall in air. Substances with high vapor densities pose a particular problem because they will collect in the bottom of tanks.
(Also called absolute humidity.) In a system of moist air, the ratio of the mass of water vapor present to the volume occupied by the mixture; that is, the density of the water vapor component. Because this measure of atmospheric humidity is not conservative with respect to adiabatic expansion or compression, it is not commonly used by meteorologists. Compare mixing ratio, specific humidity, relative humidity, dewpoint.
the tendency of a gas or vapor to rise or fall in air. Air has a vapor density of 1.0; gases and vapors with vapor densities less than 1.0 will rise in air; those with vapor densities greater than 1.0 will sink in air.
The weight of a vapor or gas compared to an equal volume of air. Air is rated as 1. Vapors heavier than air (toluene is 3.2) accumulate in low areas where they may pose health hazards to small children.
The relative density or weight of a vapor, compared to air. A comparison of any gas or vapor to the weight of an equal amount of air. The weight of a vapor or gas compared to the weight of an equal volume of air; an expression of the density of the vapor or gas calculated as the ratio of the molecular weight of the gas to the average molecular weight of air, which is 29. Materials lighter than air have vapor densities of less than 1.0.
