There is no similarity between vapor density and firefighting - one is a measure of the density of a gas or vapour relative to another (often Hydrogen or air) and the other is heroic job.
pyrotechnique
I sugest you look up "steam tables". Since convection currents are caused solely by diferences in density ... yes, it is assumed that tempreture diferences CAUSED the density gradiant - but that is not always true.
Upthrust cancels weight out, weight is there but you do not feel it.
gas matter's characteristics is GAS
Density
A gas with a vapor density less than 1 will float in air, while a gas with a vapor density greater than 1 will sink. Since the vapor density of the gas is 1.2, it will sink in air.
Vapor pressure is the pressure exerted by a vapor in equilibrium with its condensed phase (liquid or solid) at a given temperature. Vapor density, on the other hand, is the mass of a vapor per unit volume of air. In essence, vapor pressure relates to the equilibrium between the vapor and its condensed phase, while vapor density pertains to the mass of vapor in a given volume of air.
The vapor density of carbon monoxide is 14.0 g/L at standard temperature and pressure (STP). This means that carbon monoxide is slightly lighter than air, which has a vapor density of 28.97 g/L at STP.
The relationship between molecular mass and vapor density is that they are proportional to each other. Vapor density is defined as the mass of a vapor relative to the mass of an equal volume of air, while molecular mass is the mass of a molecule of a substance. Therefore, a higher molecular mass will result in a higher vapor density.
When water vapor is added to the air, the density of the air decreases. This is because water vapor molecules are less dense than dry air molecules.
apex
The vapor density of air is the ratio of the mass of a certain volume of air to the mass of an equal volume of a reference gas, typically hydrogen or dry air. It is used to compare the density of a gas to that of another gas or to the average molecular weight of air. The vapor density of air is approximately 1.29, meaning that air is slightly heavier than the reference gas hydrogen.
The density of water vapor can vary depending on temperature and pressure. At standard temperature and pressure (STP), the density of water vapor is approximately 0.804 grams per liter (g/L). However, as temperature increases or pressure decreases, the density of water vapor decreases.
The density of bromine vapor at STP (Standard Temperature and Pressure) is approximately 7.57 g/L.
The vapor density of an equimolar mixture of methane (CH4) and oxygen (O2) would be the average of the individual vapor densities of methane and oxygen. The vapor density of methane is approximately 8 g/L and oxygen is approximately 16 g/L, so the equimolar mixture would have a vapor density close to 12 g/L.
Vapor density refers to the density of a vapor compared to the density of air at a given temperature and pressure. It is commonly used to compare the weight of a vapor to an equal volume of air, which can help in understanding how it will disperse in the atmosphere.
Firefighting is a job about fighting fires it says it in the name