The gaseous form of substances that are normally in the solid or liquid state (at room temperature and pressure). The vapor can be changed back to the solid or liquid state either by increasing the pressure or decreasing the temperature alone. Vapors also diffuse. Evaporation is the process by which a liquid is changed into the vapor state and mixed with the surrounding air. Solvents with low boiling points will volatilize readily. Examples include benzene, methyl alcohol, mercury, and toluene.
The gaseous form of any substance that is usually a liquid or a solid. Most liquids vaporize continually. The rate of evaporation increases as the temperature rises. Vapors are easily inhaled.
The gaseous form of substances which are normally in the solid or liquid state, and which can be changed to these states, either by increasing the pressure or decreasing the temperature alone. Vapors diffuse.
The gaseous form of a substance, which is solid or liquid under ordinary conditions.