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.
Doesn't this mean that by information engineers means something different as
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.
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