What is the difference between vapour and gas? Vapor implies the existence of a condensed phase that is the source or destination of the gas, or with which the gas may be in equilibrium; while gas does not make such an assumption
thermodynamics - Why do we have water vapor at room temperature and . . . 1 Think of molecules of water liquid escaping into vapor, and molecules of water vapor condensing into liquid Both processes occur simultaneously, and an equilibrium is reached in a closed system The molecules in vapor form create a specific vapor pressure at a given temperature, as explained by the kinetic theory of gases
General rules for deciding volatility - Chemistry Stack Exchange Volatility is directly related to a substance's vapor pressure At a given temperature, a substance with higher vapor pressure vaporizes more readily than a substance with a lower vapor pressure (Taken from Wikipedia) But this doesn't seem to work--I recall that methanol is less volatile than ethanol I think you have got this wrong
vapor pressure - What is the difference between volatility and . . . A measure of volatility is the vapor pressure There is a very related term partial pressure So if we think of air as being nitrogen and oxygen, then there is a partial pressure for nitrogen and a partial pressure for oxygen, and the sum of the two partial pressure is the actual pressure (the absolute pressure)
thermodynamics - Why do liquids vaporise spontaneously at temperatures . . . the ∆G is zero at its boiling point (the thermodynamic definition of boiling point), and becomes positive at temperatures below the boiling point However every liquid has a characteristic vapour pressure at all temperatures How does this happen even though the ∆G has become positive thus the reaction has lost spontaneity?