00:01
Phase diagrams, how do those work? well, the most common phases we're familiar with are solid liquid and gas, but there are other phases for different materials.
00:14
But we'll just be considering solid liquid and gas, so a three -phase material.
00:21
Typically, what you do is you plot the behavior on what's called a phase diagram, and it's usually the existence of the material.
00:32
As a function of both pressure and temperature.
00:38
And let's see how we would divide this phase diagram into three different areas for solid liquid gas.
00:45
There's a lot of possibilities, so i'll draw a very simple situation where the three phases kind of make a existence like this.
00:58
This is not very common, but what you see about this is that there is a region for each material, solid, liquid, and gas.
01:08
We'll just make up these regions.
01:14
And the lines that demarcate each area are what are called coexistence lines.
01:21
And that is where the material behaves both as a solid and a liquid.
01:29
And often it's happening that the transition is occurring, say, at a constant temperature, but you're changing the system so that the bonding and the material either transforms from solid to liquid or vice versa.
01:46
So that's called a coexistence curve, and notice that it happens between any two phases.
01:54
As i said, that's not a very common phase diagram...