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I need help on a student's question. We were discussing the states of matter and when we came to plasma I did not have a good answer for what plasma is other than it is found in the stars and does not occur on earth. Can you give me more information on this subject?

Plasmas are often called the fourth state of matter and can be found on Earth in lightening and laboratories as well as the extreme upper atmo- sphere. Although like a gas, plasmas behave slightly differently because they are mixtures of positive ions and negative electrons; hence they respond to electromagnetic fields.


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