Prompt scrap. The chassis and casing for a high-end portable computer is milled from a solid high-strength aluminum alloy block initially weighing 2 kg. In doing so, 80% of the block is removed by...

Prompt scrap. The chassis and casing for a high-end portable computer is milled from a solid high-strength aluminum alloy block initially weighing 2 kg. In doing so, 80% of the block is removed by rough machining and a further 5% by finish machining. How does the machining energy compare with the initial embodied energy of the block if made from virgin aluminum? If instead 100% recycled aluminum is used for the block, does the ranking change?