4,946 reputation
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bio website tcm.phy.cam.ac.uk/~gz218
location Cambridge, United Kingdom
age 29
visits member for 4 years, 7 months
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2d
reviewed Approve Is the Keppe Motor “real”?
2d
reviewed Approve Is Keshe's technology for real?
2d
reviewed Reject Intuitive definition of electromagnetic field
Aug
23
comment About the factorial N! in the partition function
@ConstantineBlack If you subscribe to Jaynes's point of view, then you can approach in two ways. One is to identify what macroscopic variables you can control, and make sure that controlling them leads to reproducible consequences. Then, you can just apply the obvious formulae and whatever should happen will happen. The other approach is phenomenological, which requires an additional hypothesis about how the entropy should change with system size -- the Clausius relationship only tells you how it changes with energy and temperature.
Aug
21
comment About the factorial N! in the partition function
Notice that the paper by Jaynes already has the answer: spin systems have long range forces, which as mentioned in the answer by Kyle below, means that the partition function doesn't factorise, and indeed the entropy is not extensive anyway, so you don't want such factors in it.
Jun
29
awarded  Popular Question
May
13
awarded  Popular Question
Apr
3
awarded  Enlightened
Apr
3
awarded  Nice Answer
Feb
8
reviewed Approve How do I set up the Biot-Savart equation for the magnetic field inside a circular loop of current
Jan
25
awarded  Pundit
Jan
21
awarded  Yearling
Oct
12
awarded  Nice Answer
Oct
12
reviewed Approve Hamiltonian for Electron in Magnetic Field with Symmetric Gauge in Polar Coordinates
Sep
25
reviewed Approve Why, in spin sums, we sum over final spin states and average over initial states?
Sep
25
reviewed Approve Why are most metals gray/silver?
Sep
23
reviewed Approve Is it possible to have a rate of change of acceleration?
Sep
23
reviewed Approve If a spaceship were to be able to travel at light speed, would it pass through objects undamaged? Would it damage/destroy objects?
Sep
3
reviewed Approve Why group velocity represents energy or information transmission? What relation between phase velocity and special relativity
Aug
22
reviewed Approve How long does it take plasma to radiate its heat?