MW (GAS) MW (AIR)


MW (GAS) MW (AIR) :

Vapor density is the weight of a volume of pure vapor or gas (with no air present) compared to an equal volume of dry air, at the same temperature and pressure. This information assists in determining the location of a sensor. A vapor density figure of less than 1 indicates that the vapor is lighter than air and will tend to rise in a relatively calm atmosphere. A figure greater than 1 indicates that the vapor is heavier than air and may travel at low levels for a considerable distance to a source of ignition and flash back (if the vapor is in the flammable range). Note that some gases such as ethane have a vapor density of 1 and may be present at low levels or may rise significantly, dependent upon ambient conditions

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