00:01
Expansion volume work, which is what's happening here, is equal to the change in the volume multiplied by the pressure.
00:10
This will give us units of liter atmospheres, which we can then convert into joules or kilojoules.
00:17
They didn't specify what work units to use.
00:20
So the piston with an area of 100 centimeters cubed ends up being pushed out an additional 10 centimeters against two atmospheres of pressure.
00:35
So the change in volume is going to be the 100 centimeters squared, which is the cross -sectional area, multiplied by the distance that it moved, 10 centimeters.
00:49
This gives us centimeters cubed, which we can convert into liters.
00:55
This is negative also, recognizing that there are a thousand centimeters cubed for every one liter.
01:08
So essentially the change in volume was one liter.
01:11
We multiply that by the pressure against which it expanded one atmosphere, sorry, two atmospheres.
01:20
And we get 2 .0 liter atmospheres, which we can then convert into joules.
01:30
This will be negative...