But the stirring quickly degenerates into the same random motion as if it were not stirred.
And in reality no more work is done by the piston whether or not shock waves are produced. As a transient process, the energy may be divided differently than before with some of the energy in shock waves and less in T, but when the shock wave is dissipated you are right back where you were.
Bob at PC
________________________________________
From: phys-l-bounces@carnot.physics.buffalo.edu [phys-l-bounces@carnot.physics.buffalo.edu] On Behalf Of John Denker [jsd@av8n.com]
Sent: Tuesday, January 12, 2010 4:11 PM
To: Forum for Physics Educators
Subject: Re: [Phys-l] T dS versus dQ
On 01/12/2010 01:07 PM, LaMontagne, Bob wrote:
... If the gas is ideal, the pressure as a function of volume -
Not *purely* a function of volume.
In general, P = N RT / V
V appears on the RHS, but it is not the *only* thing
that appears on the RHS.
At constant V, stirring the gas raises the temperature
and pressure.
Stirring is a key element of the scenario Carl constructed.