00:02
Hi there.
00:03
In this question, we have a phase diagram where it shows the different phases of a substance at different temperatures and pressures.
00:12
So we're starting off with a sample of x, and it's at negative 134 degrees celsius.
00:20
Well, our graph is in kelvin.
00:22
So i'm going to add 273 to this to get a kelvin temperature.
00:27
And the kelvin temperature then would be 139.
00:31
So we have 139 kelvin and 5 .0 atmospheres.
00:41
So if we look at where that is on our graph, we look up the y -axis to where we see the 5, somewhere right about up in here.
00:53
And we look for 139 on the x -axis, going to be somewhere approximately around here.
01:02
That gives us a point right there in the liquid range.
01:08
So this one, under these conditions, substance x would be a liquid.
01:16
All right.
01:17
So now we're keeping the temperature where it is, but we are reducing the pressure by 3 .4 atmospheres.
01:25
So we still have 139 kelvin.
01:28
However, if we take 5 .0 and subtract 3 .4, it's only going to be 1 .6 atmospheres.
01:37
So now if we look at that, temperature is still the same.
01:41
So it's not changing where it is along the x -axis, but that one dropping it to 1 .6 is going to drop us down below the line where it transitions from a liquid to a gas...