2nd Law of Thermodynamics (0310)

2nd Law of Thermodynamics

The three important variables: pressure, volume, and temperature

The graphs describe the relationship between P,V, and T

Here we derived d(PV)/dT (not dQ). The result is dP/dV= A(V)/V, which explains why the graph between Pressure and volume has the downward curve slope

 The band would expand upward (compressed) to compensate the equation F/L= -Y*alpha* delta T

 Here are four steps of how heat engine works. Notice that this is an ideal heat engine, the temperatures of both surroundings and heat engine do not change afterwards.

Here is the plot of 4 points. The area inside is the net work done.

 For the work done between two points, the work done is the area under the curve not inside the curve (or area)

We were calculating the work done by the system.

Experiment to find the the work done of the system.

We learned that that E_int =(3/2) nRT= (3/2) PV. And Stoke's theorem.