7/17/2019 Gas and Vapor

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difference between gas and vapor

The word vapor in its natural state is a solid or liquid at room temperature. However, a gas in its

natural state at room temperature would still be a gas. Example: 1) steam would be a vapor because

at room temperature, it would be water, which is a liquid. 2) Nitrogen (a gas) at room temperature

would still be in a gaseous state.

To make it more simple, a vapor is a substance which has experienced a phase change. Whereas, a

gas is a substance which has not, and will not experience a phase change.

Gas is a state of matter while vapor is not.

A gas is a substance above its critical temperature but below its critical pressure, while a vapor is a

substance above its boiling point temperature.

A vapor is a gas. To me, the word, "vapor" suggests a gas that was formed by evaporation of

something that is a liquid at room temperature. For example, water vapor. It also connotes a gas that

can be seen.