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Re: [Phys-l] Entropy Increase Question



On 03/13/2010 04:03 PM, Tony wrote:
Is there a situation where the condition of a body or system experiences a
change without an increase in entropy -Assuming you are going to count any
changes in the surroundings as well? If so, what would it be?

Almost anything is a little bit dissipative, but often the
dissipation can be neglected to an excellent approximation.

Examples include:

-- Nondissipative rotation: the angle changes.

-- Undamped Keplerian orbits.

-- Undamped harmonic oscillator.

-- Straight-line motion of a free particle.

-- Flow of superfluids (including superconductors).

If this doesn't answer the question, please clarify the question.