00:01
When we take some water in a container and we lower the temperature, we're going to be increasing the water's desire to stay with itself.
00:16
Right? because as we lower it, if we lower it eventually to the point where ice starts to form, it's going to be less and less favorable for the water to exist up here in vapor form.
00:28
So as a result, the total pressure is going to decrease if we lower the temperature.
00:40
So this you could also see if you just look at the equation pv equals nrt, assuming that we're keeping the volume, the amount, constant, and r, of course, is always constant.
00:53
If we lower pressure, then we'd have to be lowering temperature, and vice versa.
00:58
If we lowered the temperature, then we'd have to be lowering the pressure.
01:02
So now let's move on to b.
01:05
If we're doubling the volume of the container, we're going to ask, is there any change that's happening here? now, pv equals nrt is not actually valid in this circumstance, because even though we've greatly increased the size of this container, we know that only intermolecular forces and temperature affect our pressure.
01:32
So in fact, the pressure is going to remain constant.
01:38
So p1 equals p2.
01:41
Because the extra amount that we're going to generate, this is going to result in more of our water evaporating...