To:
From: "Steve Oostrom"
Reply-To: trekcreative{at}yahoogroups.com
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I found the passage in "In Fire," act three, that referred to
temperature d= ensity
and read the entire scene to understand the context in which that expressio= n
appears. I really don't remember what I was thinking when I used that
expression, but Jay's explanation is approaching it:
>My interpretation of temperature density comes from reading pop science
and it may not be totally accurate. Correct me if I am wrong, Steve.
>When dealing with Plasma, or a particle stream, there are two factors to
its temperature
>One is how much energy each particle posesses, an indivudual particle may
be screaming along at high speed (And therefore be be considered very
"hot") But it can only transmit so much energy at one time.
>For things like Plasma, the density of the plasma determined how much
energy it could transmit to another object. So for very, very rarified
plasma (Only a few atoms per cc of space) the multiplier of the
temperature times it's density is low. even if the individual particles
were very hot, they just couldn't transmit enough heat to you to damage
you.
>However if the density times the temperature is higher - like in the
flame at the tip of a lit match - there's billions of atoms there. The
temperature isn't very high by physics standards but so many atoms are
available to transmit enrgy into your finger it will burn you. It temp is
low, but the density is high.
>So this idea is contracted to temperature density. A measure of how
dense a medium is, versus how how it is.
>My discussion above ignores the idea of radiant energy, because it can
vary with the temperature density of the medium as well, and that would
just serve to confuse the issue.
The idea of "temperature density" is that a very diffuse gas at a
very high temperature would have a different effect on something, say a
starship hull=
,
then a gas that is at higher concentrations but at a lower temperature.
Such a gas would transfer a larger amount of energy to the hull than a
thinner gas at higher temperature. Basically, temperature density is a
measure of heat transfer to a starship hull, for example, by the
surroundin= g
medium. A very hot plasma at low density would transfer less heat.
Temperature density is usually used in a relative sense. Given a field of
plasma or gas, low temperature density would mean less heat transfer to the
ship than normal for a standard field of gas. In the story, the fac= t
that
the plasma belts were on fire meant that its temperature density was higher
than normal and hence passage through the energy field was risky.
Steve
The Universe Unbounded.
Visit "Star Trek: Athena" at http://ussathena.iwarp.com
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I found the passage in "In
Fire," act three, that
referred to temperature density
and read the entire scene to understand the
context
in which that expression
appears. I really don't
remember what I was
thinking when I used that
expression, but Jay's explanation
is approaching
it:
>My interpretation of temperature density comes from reading pop
scienceand it may not be totally accurate. Correct me
if I am wrong, Steve.>When dealing with Plasma,
or a particle stream, there are two factors toits
temperature>One is how much energy each particle
posesses, an indivudual particle maybe screaming along at high
speed (And therefore be be considered
very"hot") But it can only transmit so much
energy at one time.>For things like
Plasma, the density of the plasma determined how
muchenergy it could transmit to another object. So for
very, very rarifiedplasma (Only a few atoms per cc of
space) the multiplier of thetemperature times it's
density is low. even if the individual particleswere
very hot, they just couldn't transmit enough heat to you to
damageyou.>However if the density
times the temperature is higher - like in theflame at
the tip of a lit match - there's billions of atoms there.
Thetemperature isn't very high by physics standards but so many
atoms areavailable to transmit enrgy into your
finger it will burn you. It tempis low, but the density
is high.>So this idea is contracted to temperature
density. A measure of howdense a medium is,
versus how how it is.>My discussion above
ignores the idea of radiant energy, because it canvary
with the temperature density of the medium as well, and that
wouldjust serve to confuse the issue.
The idea of "temperature
density" is that a very
diffuse gas at a very high
temperature would have a different effect on
something, say a starship hull,
then a gas that is at higher
concentrations but at
a lower temperature.
Such a gas would transfer a larger amount of
energy
to the hull than a
thinner gas at higher temperature.
Basically,
temperature density is a
measure of heat transfer to a
starship hull, for
example, by the surrounding
medium. A very hot
plasma at low density
would transfer less heat.
Temperature density is usually
used in a relative
sense. Given a field of
plasma or gas, low temperature
density would mean
less heat transfer
to the ship than normal for a
standard field of
gas. In the story, the fact that
the plasma belts were on fire meant that its
temperature density was higher
than normal and hence passage
through the energy
field was risky.
Steve
The Universe
Unbounded.
Visit "Star Trek: Athena" at http://ussathena.iwarp.com;">http://ussathena.iwarp.comhttp://ussathena.iwarp.com">http://ussathena.iwarp.com;
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