00:01
All right, so let's do some conversions in pressure units.
00:05
And when we're doing these conversions, you're going to have to know the standard conversions between units.
00:11
So each of these mean the same thing.
00:16
One atm, which is an atmosphere, is equal to 760 millimeters of mercury, which is also equal to 760 millimeters of mercury, which is also equal to 760.
00:33
Tour which is equal to 1 .01325 times 10 to the fifth pascal's which is the same as 101 .325 which is also equal to 1 .01 .325 kilo pascales which is also equal to 1 .01 325 bar.
01:16
So these are all pressure units, atmospheres, millimeters, and mercury, tor, pascal's, kilo -pascals, bar, all units of pressure, and each of these numbers represents the same pressure.
01:30
So we can use dimensional analysis to be able to convert between one unit and another.
01:36
So let's say, for instance, that we have 265 tor.
01:40
And if we want to convert that into atmosphere, we're going to use some dimensional analysis.
01:47
So remember the unit we want to cancel goes on the bottom.
01:51
The one we want goes on the top.
01:53
And then we find our number within our conversion.
01:56
So the number before atmosphere is one and before tor is 760.
02:03
Remember the decimal point means that that zero is significant.
02:06
So we can answer this to three sig -figs.
02:10
And when we do our math, we wind up with point three.
02:14
49 to three significant figures, atmospheres.
02:20
And then if you want to double check your units, you can see torr divided by tor cancels out and you're left with atm, which is what we want.
02:28
Now we can go ahead and do a couple more conversions with this.
02:32
So if we wanted, instead of going to atmospheres, we wanted to go to millimeters of mercury.
02:41
Well, we can look...