Plasma: The Presentation - Home | Santa Rosa Junior...
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Plasma: The Presentation
K.C. Brunk &
Christian Pickett
5/6/14
PHYS43, SRJC
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A Practical Definition • Plasma is the fourth state of matter. In plasma the electrons are unbounded from the nuclei due to very high temperatures or large voltage potentials.
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Gas versus Plasma
Form:
Neither gas nor plasma have definite form or volume.
Electrical Conductivity:
In gas it is very low, while in plasma it is extremely high.
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Interactions: Usually one-on-one collisions in gas.
In plasma each particle is constantly interacting with electric and magnetic fields over long distances.
Velocity Distributions:
Gas is usually assumed to be in thermodynamic equilibrium.
In plasma individual particles can have wildly different speeds.
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Cool versus Hot Plasma
Some plasma can form at low temperatures. This plasma (such as the type found in a plasma globe) may either have only a small fraction of its total mass ionized or have only electrons at high tempatures. Hot plasma is the term used to describe generic plasma such as in the sun.
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Though naturally occurring plasma is rare on earth, it is the most plentiful form of matter in the universe.
Reentry plasma trail from Space Shuttle Atlantis ---->
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Ghost Nebula
Plasma in space • Stars
• Coronas
• Solar wind
• Star nurseries
• In the magnetic fields of many planets
• Interplanetary, interstellar, and intergalactic mediums
• The accretion disks and accretion disk jets of black holes
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Terrestrial Plasmas • Fire (when hotter than 1500°C)
• Lightning
• Anything made of lightning
• Aurora Borealis
Plasma
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Artificial Plasmas
• Neon Signs and florescent lights
• Plasma Globe
• Arcs from arc welders
• Arcs from Tesla coils
• Sparks of static electricity
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Fusion & Plasma Containment
• Modern plasma theory has developed to meet the demands of fusion research.
• Because of the extreme heat of most plasmas, conventional materials cannot be used.
• However, Plasma is an excellent conductor. This means it can be easily manipulated using magnetic fields.
Tokamak Reactor
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Credits http://www.thunderbolts.info/tpod/2005/arch05/051114currents.htm (img 1)
http://en.wikipedia.org/wiki/Plasma_%28physics%29(img 2 & 3)
http://en.wikipedia.org/wiki/Sun (img 4)
http://en.wikipedia.org/wiki/Lightning(img 5) http://en.wikipedia.org/wiki/Plasma_globe(img 6)
http://energyclub.stanford.edu/ckfinder/userfiles/images/Dean1.jpg (img 7)
http://en.wikipedia.org/wiki/Neon_lighting (img 8)
http://tylercreatesworlds.deviantart.com/art/The-Ghost-Nebula-301172187 (img 9)
http://en.wikipedia.org/wiki/Plasma_%28physics%29#Generation_of_artificial_plasma
http://web.ornl.gov/sci/fed/Theory/tt/ttmcp/ttmcp.htm
http://www.plasmas.org/plasma-physics.htm