Maxwells demon, Physics

Maxwell's demon (J.C. Maxwell):

A thought experiment demonstrating the concepts of entropy. We have a container of gas that is partitioned in two equal sides; each side is in thermal equilibrium along the other. The walls & the partition of the container are perfect insulators.

Now suppose there is a very small demon that is waiting at the partition beside a small trap door. He can open & close the door along with negligible work. Let's say he opens the door to let a fast-moving molecule to travel from the left side to the right side, or for a slow-moving molecule to travel from the right side to the left side, & keeps it closed for all other molecules. The total effect would be a flow of heat from the left side to the right side even though the container was in thermal equilibrium. Clearly this is a violation of the second law of thermodynamics.

Thus where did we go wrong? It turns out that information ought to do with entropy as well. To sort out the molecules according to speeds, the demon would keep a memory of them  and it turns out that enhance in entropy of the maintenance of this plain memory would more than make up for the reduction in entropy because of the heat flow.

Posted Date: 3/28/2013 6:06:46 AM | Location : United States







Related Discussions:- Maxwells demon, Assignment Help, Ask Question on Maxwells demon, Get Answer, Expert's Help, Maxwells demon Discussions

Write discussion on Maxwells demon
Your posts are moderated
Related Questions
Medicines: 1. Iodine 131 is used for the study of thyroid glands. 2. Radiation in low dosage can also be used for sterilizing bandages. 3. Radio-Cobalt-60 has been widely

It is defined as an electric strain produced in an atom due to application of external electric field to the bulk material. It is the result of the displacement of the positively c

ELASTIC COLLISION:  "The collision in which both linear momentum and K.E are conserved is said to be elastic collision".                  OR "In the ideal case when no K

Dirive an expretion for low of succecive disintigretion

Points O, A, and P lie in one as well as the same vertical plane. Point A is 4 . 0 cm due east of point O starting at point O one is able to arrive at point P by going 6 . 0 cm due

A 240-turn solenoid having a length of 21 cm and a diameter of 8.8 cm carries a current of 0.44A. Calculate the magnitude of the magnetic field inside the solenoid.

A 0.040-kg bullet is fired into a 3.50-kg block of wood, which was initially at rest.  The bullet remains embedded within the block of wood after the collision. The bullet

Image Formation for Concave Mirrors - Case B To see an object in any kind of mirror, a person must sight along a line at the image of the object. Every person capable of seeing

In the circuit shown in Figure, the slider S is at the half-way point. (a) Calculate the p.d. across and the current flowing in the 400 Ω load resistor. (b) Is the circuit a

Determine the inductance of a solenoid of 2000 turns round uniformly over a length of 50 cm on a cylindrical paper tube 4 cm in diameter. The medium is air.