On 21.01.2012 21:01 meekerdb said the following:
On 1/21/2012 11:23 AM, Evgenii Rudnyi wrote:
On 21.01.2012 20:00 meekerdb said the following:
On 1/21/2012 4:25 AM, Evgenii Rudnyi wrote:
...
2) If physicists say that information is the entropy, they
must take it literally and then apply experimental
thermodynamics to measure information. This however seems not
to happen.
It does happen. The number of states, i.e. the information,
available from a black hole is calculated from it's thermodynamic
properties as calculated by Hawking. At a more conventional
level, counting the states available to molecules in a gas can be
used to determine the specific heat of the gas and vice-verse.
The reason the thermodynamic measures and the information
measures are treated separately in engineering problems is that
the information that is important to engineering is infinitesimal
compared to the information stored in the microscopic states. So
the latter is considered only in terms of a few macroscopic
averages, like temperature and pressure.
Brent
Doesn't this mean that by information engineers means something
different as physicists?
I don't think so. A lot of the work on information theory was done by
communication engineers who were concerned with the effect of
thermal noise on bandwidth. Of course engineers specialize more
narrowly than physics, so within different fields of engineering
there are different terminologies and different measurement methods
for things that are unified in basic physics, e.g. there are
engineers who specialize in magnetism and who seldom need to reflect
that it is part of EM, there are others who specialize in RF and
don't worry about "static" fields.
Do you mean that engineers use experimental thermodynamics to determine
information?
Evgenii
Brent
Evgenii
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