The envelope of gas that surrounds an object in space is a space
charge. Electric charge is treated as a continuum of charge that is
distributed within a volume or area of space.
The envelope of gas that surrounds an object in space is a space
charge. Electric charge is treated as a continuum of charge that is
distributed within a volume or area of space.
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The answer is an envelope. It
contains a letter.
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The word is "envelope" (which usually holds only one
letter).