00:01
In this example, we want to describe four processes.
00:05
We want to describe boiling, condensation, melting, and freezing in terms of energy transfer and phase.
00:12
Ok, so then we want to give an example of each.
00:14
So let's start with boiling.
00:19
Ok, so we raise a substance just to its vaporization point.
00:27
And then what we do is add energy.
00:30
So add e, ok, sufficient to change phase from the liquid state, so from liquid to gaseous state.
00:59
And then for condensation, it's the opposite.
01:02
So condensation, we remove sufficient heat energy, remove e, sufficient to change.
01:22
And now we're going the opposite way, so from gas to liquid.
01:27
And this is at vaporization temperature, the same temperature as for the boiling case.
01:37
Now we're going to move on to melting and freezing.
01:41
And this has a very similar analogy.
01:45
So for melting, we want to add sufficient energy, heat energy.
01:52
Ok, so add e, sufficient to go from solid to liquid phase...