. . . . . . . . . . . . . . . . . . . . "Thermodynamic Energy"@en . . . . . . . . . . . . . . . . . . . . . . . . . "For a closed thermodynamic system, \\(\\Delta U = Q + W\\), where \\(Q\\) is amount of heat transferred to the system and \\(W\\) is work done on the system provided that no chemical reactions occur."^^ . . . "http://www.iso.org/iso/catalogue_detail?csnumber=31890"^^ . . . "U" . . . . . .