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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
evaporation - What is the difference between smell odor and vapor . . . 1 What is the difference between "smell odor" and "vapor" of a substance? It is assumed that the vapor of a given compound element is the gas phase of the same pure compound element By condensing the vapor, you can obtain the same stuff in liquid or solid form Smell on the other hand is a human animal perception
General rules for deciding volatility - Chemistry Stack Exchange In chemistry and physics, volatility is the tendency of a substance to vaporize 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
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
physical chemistry - Why is octane more volatile than water while . . . 14 Octane has a boiling point of 120 °C Water has a boiling point of 100 °C The definition of boiling point is, "the temperature which the liquid substance's saturated vapor pressure equals the atmospheric pressure" Volatile substances have higher saturated vapor pressure at a given temperature, than the lesser volatile substances
boiling point - Phases in equilibrium and not in equilibrium . . . Water vapor exists below boiling point, and boiling just happens to be a point when water vapor can exist as bubbles in a liquid For question 2, Why are the phase separation lines called equilibrium lines? As you said, is the water vapor not always in equilibrium with the liquid even outside of the phase separation lines?
gas laws - Why can air accommodate more water when the air has a higher . . . The liquid-vapor coexistence line of the phase diagram of water has a positive slope $\mathrm {d}P \mathrm {d}T$ Humidity in air is a partial pressure of water vapor If partial pressure of water is increased starting from $<100\%$ humidity, it will reach the vapor-liquid transition and any additional water vapor will simply condense into droplets ($=100\%$ humidity) The first-order phase