Talk:Vapor pressure
From Academic Kids
I think the last mentioned temperature is not the melting point but the triple point. Is that correct?
- Actually, no. When the vapor pressures of liquid and solid are equal only if the two phases (liquid and solid) are in equilibrium. If these pressures are also equal to the total pressure, then the gas phase is in equilibuim, too ( three phase -> triple point) -- Olof
And another question: to which substances does this discussion apply? Wood for instance doesn't have a vapor pressure, does it?
- Sure it does. This is why I put wood in the garage for a year before putting it in the fireplace: some of its components ( water ) sublimate. However, wood is a multicomponent material, so it is better to think of vapor pressures of each of its components. -- Olof
And yet another one: what is the vapor pressure of solid water at 50 degrees Celcius? AxelBoldt
- Higher than the vapor pressure of liquid water at 50 degrees Celsius. The fact that we know that it is higher doesn't imply that we are able to actually measure the value, although it could be estimated by extrapolating data from the temperature range where water is stable.
- I've got to admit, though, that this page is quite confusing, and could use a better explanation of all the concepts. -- Olof
[edit]
comparing and contrasting the dependence of the temperature.......
In a simple distillation, am I correct in assuming that the temperature of the liquid and vapor are equal? I am trying to compare and contrast the dependence of temperature on the distillate volume of cyclohexane and toluene.
I find it easy to compare the temperature with the mixture, but would like to find some contrasting factors. Email is charlespr01@hotmail.com
Chuck
