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 The origin of vapor is presumably Latin with earlier roots in Ancient Greek The origin of the word gas appears to be the Greek word chaos by way of Dutch:
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
How to calculate the vapour density of a mixture? Was it safe to assume that the amount of substance of mixture equals that of the amount of substance of both the gases? Amount of substance is additive, just like mass You have to be careful with volume, though So yes, it is safe to make that assumption I have to figure out the vapour density of the mixture I'm not sure you are starting with a safe question, i e if the vapour density