Understanding Vapor Density
* Vapor Density is the ratio of the density of a gas to the density of air at the same temperature and pressure.
* A vapor density of 1 means the gas has the same density as air.
* A vapor density greater than 1 means the gas is denser than air.
* A vapor density less than 1 means the gas is less dense than air.
Applying the Information
Since the gas has a vapor density of 1.2, it is denser than air.
Conclusion
Therefore, a gas with a vapor density of 1.2 will sink in air.
