Docstoc

Plasma

Document Sample
Plasma Powered By Docstoc
					Plasma: The Fourth State of
         Matter


                       QuickTime™ and a
             TIFF (Uncompressed) decompressor
                are needed to see this picture.
       What Do You Know?
• Describe the 3 states of matter using
  water as an example and discuss
  how water changes from state to
  state.
 What causes this change of state?
 What is happening on an atomic
  scale?
              States of Matter
  3 states of mater          • What causes the
• Solid – water freezes it     change of shape?
  turns into ice. Solids     • Heat
  do not change shape
                             • Cold
  easily
                             • Temperature
• Gas – when the water
  boils it vaporizes.
  Gases move very fast
• Liquid – move slowly
What happens at an atomic level?
• Atoms are always vibrating
• The hotter substances the more the atoms
  vibrate.
• The cooler the substance the less the atoms
  vibrate.
    What is happening on an
        atomic scale?

• Removing or adding heat causes the motion
  of atoms to change.
• The hotter substance the more the atoms
  move.
• The colder the substance the less the atoms
  move.
  The 3 States of Matter Activity
• Add 100mL of water to
  your beaker
• Drop the chunk into the
  water
• Observe the reaction and                 QuickTime™ and a
                                 TIFF (Un compressed) decompressor

  find the 3 states of matter.
                                    are neede d to see this picture.




• Write 1 sentence to
  describe each state of
  matter in your beaker
On an Atomic Scale: Solids
                                       • The molecules/atoms
                                         in a solid are bonded
                                         together and cannot
                                         change their position.
          QuickTime™ and a
TIFF (Un compressed) decompressor
   are neede d to se e this picture.   • This allows a solid to
                                         maintain its shape
                                         without a container.
On an Atomic Scale: Liquids
                • The liquid bonds are
                  strong enough to hold
                  the molecule/atoms
                  together but weak
                  enough that they can
                  slide along the surface
                  of neighboring atoms
                • Liquids have no shape
                  and can only maintain
                  the shape of their
                  container.
On an Atomic Scale: Gases
             • Although the bonds that
               hold the molecules of gas
               together are strong, the
               bonds that hold them next
               to each other are very
               weak.
             • The bonds that hold the
               molecules together are too
               weak to hold them next to
               each other, allowing gas
               molecules to drift apart
               randomly.
What are the Driving Force of all
      Changes of matter?
             Energy
• Adding Energy breaks bonds
• Adding Energy speeds the motion of
  molecules
 Plasma, the Fourth State of
           Matter
                                      • The bonds that held gas
                                        molecules together are
                                        broken and even the
                                        electrons surrounding the
         QuickTime™ and a
                                        nucleus of atoms are
TIFF (Uncompressed) decompre ssor
   are neede d to see this picture.     broken free
                                      • Positively charged nuclei
                                        and negatively charged
                                        electrons zooming about
                                        in random patterns
       Characteristics of Plasma
• The most abundant form
  of matter in the universe
• Behaves like a gas,
  BUT…
                                           QuickTime™ and a
• An overall neutral state of   TIFF (Unc ompres sed) dec ompres sor
                                   are needed to see this pic ture.
  matter
• Components are charged
  ions (positive and
  negative)
Naturally occurring Plasma

                                                              QuickTime™ and a
                  Qu ic kTime ™ a nd a
        TIFF (Unco mpres sed ) de co mpress or
           are ne ed ed to se e th is p ic ture.
                                                   TIF F (U ncompressed) decompressor
                                                      are needed to see this picture.




                                                              Quic kTime™ and a
           QuickTime™ an d a
  TIFF (Uncompressed) decompressor
     are need ed to see this p icture .
                                                   TIFF (Unc ompres sed) decompres sor
                                                      are needed to see this picture.
             Man-made Plasma
• Energy is added to a
  system
                                          QuickTime™ and a
• Molecules are broken          TIFF (Uncompressed) decompressor
                                   are needed to see this picture.
  apart into their individual
  atoms
• Electrons are stripped
  from their nuclei
• Used for lighting,
  precision cutting, nuclear                Qu i ckTi m e™ a nd a
                                  TIFF (Un co mp res se d) de c omp res so r
                                    a re ne ed ed to se e th is pi c tu re.

  research and fusion power
So What’s the difference between
      a gas and plasma?
• Gas is electrically neutral throughout and is
  used as an electrical insulator
• Plasma is electrically charged and used as a
  conductor of electricity

				
DOCUMENT INFO