Vapor n. : Any substance in the gaseous, or aeriform, state, the condition of which is ordinarily that of a liquid or solid.

Vapor n. : In a loose and popular sense, any visible diffused substance floating in the atmosphere and impairing its transparency, as smoke, fog, etc.

Vapor n. : Wind; flatulence.

Vapor n. : Something unsubstantial, fleeting, or transitory; unreal fancy; vain imagination; idle talk; boasting.

Vapor n. : An old name for hypochondria, or melancholy; the blues.

Vapor n. : A medicinal agent designed for administration in the form of inhaled vapor.

Vapor n. : To pass off in fumes, or as a moist, floating substance, whether visible or invisible, to steam; to be exhaled; to evaporate.

Vapor n. : To emit vapor or fumes.

Vapor n. : To talk idly; to boast or vaunt; to brag.

Vapor v. t. : To send off in vapor, or as if in vapor; as, to vapor away a heated fluid.

Example:
How will increasing the temperature affect the equilibrium Vapor pressure?

Taxonomy
vapor, liquid, vapor pressure, gas, flammable liquids, free encyclopedia, Water vapor, equilibrium vapor pressure, gas phase, liquid phases, component, Petrucci, liquid droplets, liquid water, partial pressure, critical temperature, the substance, ambient temperatures.

Defination from the web:
vapor may co-exist with a liquid (or solid) ... Vapor refers to a gas phase at a temperature where the same substance can also exist in the liquid or solid state, below the critical temperature ...