Together with this concept, Abraham introduced ( like Poincar?in 1900 ) the notion of " Electromagnetic Momentum " which is proportional to \ scriptstyle { E / c ^ 2 }.
2.
He recognized that electromagnetic energy behaves like a fictitious fluid with mass density of \ scriptstyle { m = E / c ^ 2 } ( or \ scriptstyle { E = mc ^ 2 } ) and defined a fictitious electromagnetic momentum as well.
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