00:01
Hi, let us talk about first law of thermodynamics, conservation of energy, and second law of thermodynamics.
00:06
This is very interesting relationship.
00:08
So, first law of thermodynamics says that delta u is q minus w or q is delta u plus w.
00:16
This equation tells you that if you provide heat to a system, remember the sign convention, if heat is added to the system, then it's positive.
00:24
When work is done by the system, it is positive.
00:27
So let's say my delta u was zero, then if you provide.
00:30
Heat to the system, all of it will be used in work done by the system because this is positive.
00:37
So this has to be positive.
00:39
So q equals w.
00:40
This is conservation of energy when delta u is equal to zero.
00:45
This is the best case scenario.
00:47
Now, let us look at what the second law of thermodynamics says...