Re: HiFi equipment
- From: clay@xxxxxxxxxxxxxxx
- Date: Wed, 15 Oct 2008 09:24:43 -0700 (PDT)
On Oct 14, 4:02 pm, glen herrmannsfeldt <g...@xxxxxxxxxxxxxxxx> wrote:
c...@xxxxxxxxxxxxxxx wrote:
Years ago, when people were getting into all of the "magnet stuff",
I.e., like sleeping on a bed of magnets to cure back problems or
putting a magnet by the fuel line in your car to improve mileage. We
put the ads up on the bulletin board outside of the physics office and
asked students to identify as many violations of physics that they
could find. For example, magnetizing a liquid.
Since the subject is HiFi, some years ago magnetic liquids
became popular to help cool speaker voice coils. (I presume
suspended magnetic particles in a liquid base.) Otherwise,
liquid oxygen is paramagnetic, as can be demonstrated by
pouring it near the gap of a strong electromagnet.
(One of my favorite physics lecture demonstrations.)
-- glen
In fact there are oxygen sensors based upon the paramagnetivity of the
molecules. But paramagnetism is simply a response to an induction
field. As soon as the liquid moves aways from the field, its molecules
go back to random order.
Even ferroliquids are not ferromagnetic. They are strongly
paramagnetic. I can certainly see a use in speaker magnet/voice coil
structures where the liquid can help carry away the heat and still
provide a good magnetic coupling.
Liquid oxygen is a neat and famous example for your experiment, since
valance bond models won't explain its paramagnetism. One must use a
more complete molecular bond model to have electrons with unpaired
spins for oxygen.
Clay
.
- References:
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- Re: HiFi equipment
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