_:b20059 . . _:b20058 . _:b20058 . _:b20059 . _:b20116 . _:b20058 _:b20059 . "Energy density is the amount of energy stored in a given system or region of space per unit volume."@en . . _:b20116 . "energiedichtheid"@nl . _:b20059 . _:b20116 . "energy density"@en . _:b20058 . . _:b20116 .