 Okay, let's ask a few questions about this particular phase diagram as you can see the lines aren't very straight and the thing isn't drawn to scale, but hopefully you guys can deal with that, it's good enough for me, okay? So let's go ahead and talk about some of these points in this thing. So what phases are present at point D up here? What phases are going to be present? Solid and a liquid, why both of them? Because it's on the what? On the line, right? It's on the solid, liquid, equilibrium line, okay? So at point D we'll have both solid and liquid. That is the name, that's not everybody, but I'll take it. What does that mean, the triple point? Solid, liquid, and gas are all present at that time. We kept the temperature the same, but we decreased the pressure. What would happen would be present, is that okay with everybody? So what happens at this point, let's just draw a straight line, we would keep the temperature right, but decrease the pressure, so the pressure's here, right? So when we decrease the pressure, only a solid would be present, okay? So at point D and decrease pressure, only a solid, and this is temperature staying the same, right? To an extent, yeah, and then if we got down here, what would happen? Turn to, it would do what, what is that process called, going from a solid to a gas? So it would sublime from a solid to a gas, right? So down here is the gas, and up here is the liquid, as we already said, okay? So to a solid and then all the way, well, how would you, how would you decrease the pressure? So you would go to this way, but the pressure would stay the same. So what point shows the, of this substance, point C? Why do you say point C? The order between liquid and gas is like the first. There's something even more specific about it, it's at 760 millimeters of mercury, which is what? 1. 1. 1. 1. 1. 1. 1. 1. 1. 8. What is that called? And what's above the critical point? The super critical fluid. So, and then one more question about this substance, is it more dense in the solid or the liquid phase? Liquid phase. The liquid, right? And why is that? So since you've got a negative slope here and you're lying between the liquid and solid, negative slope, solid, or solid liquid line, means that the liquid more, if you had a vertical line, it would just be the same? Yeah, it would be the same. We're just, we won't, I won't give you any weird problems like that, okay? We'll just, you'll see, like, which one. Okay? Any questions on this? Any questions? Okay, cool.