Text: To completely clarify the ideas of Force Fields, the adjective "observable" or the adjective "virtual" should always be used as a modifier for the force field. E.g., in vacuum there is no observable mass, but there is virtual mass. Hence in the vacuum there are no "observable" EM force fields, but there are "virtual" EM force fields. Feynman stated that there is only the potential for the force field existing in the vacuum. In observable matter there are "observable" EM force fields. The "observable" EM force fields are made from the interaction of the "virtual" EM force fields with observable particles, and the integration of these virtual force fields into observable force fields.

See Also: VIRTUAL; POTENTIAL; VACUUM; INFINITE NINTHS

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