Cumulative General Science/Technology Quiz

[ainwood]

For a multi-component mixture, what is the name give to the pressure above which no liquid can form?

 

[sepamu92]

Is it named after a scientist?

 

[nonconformist]

Critical Point?

 

[a_propagandist]

Critical temperature?

 

[brennan]

Sorry, I thought it went without saying that Ainwood was correct. Didn't mean to bring the thread to a screeching halt.

 

[ainwood]

No, its not named after a scientist.

Critical temperature is not correct.

 

[Perfection]

Critical pressure?

 

[ainwood]

No, its not critical pressure either.

Critical pressure & critical temperature are at the transition point between liquid & vapour (bubble point and dew point). This can actually be at a lower pressure than the maximum pressure at which liquids can form.

 

[Perfection]

maximum critical pressure

 

[Genocidicbunny]

Is it not the critical point? After all, that is the point at which a substance's liquid and gas phases become indistinguishible, thus technically, no liquid can form.

 

[ainwood]

Is it not the critical point? After all, that is the point at which a substance's liquid and gas phases become indistinguishible, thus technically, no liquid can form.

Yes, but you can have liquids at a slightly higher pressure, if its also colder.

 

[Mise]

Since it's a mixture, is it part of a binary phase diagram?

 

[ainwood]

Since it's a mixture, is it part of a binary phase diagram?

Well, yes; it might not always be labelled, but with pressure on the ordinate axis, draw a horizontal line tangential to the phase diagram that just intersects at the highest point. The pressure at which it intersects the ordinate is the highest pressure at which a liquid can exist. It has a special name.

 

[Perfection]

Liquid pressure apex

 

[brennan]

I don't know either. Hope that helps.

 

[GoodGame]

Vapor pressure, unless you're talking about a specific model. Vapor pressure is the equilibrium pressure, below which, you tend to get liquid, and above which, you'll tend to get gas.

 

[ainwood]

Vapour pressure is the pressure exerted by a liquid in equilibrium with vapour. In this case, there is no liquid, so the answer is not vapour pressure!

 

[GoodGame]

Is the assumption that this is a mixture of gases?

If yes then the question is really, what pressure will avoid condensation in a mixture of gases?

 

[ainwood]

Its is a multicomponent mixture; not necessarily a mixture of gasses, because at some combination of pressure & temperature, there will be only liquid present. But there will be a maximum pressure above which there will be no liquid phase.

 

[Perfection]

So Ainy, you compress this multicomponant stuff and it becomes all solid, right?

So solidification pressure?

Or does it become gas? That seems less likely to me, but I know jack about phase transition stuff.