Mirror-Polished Japanese Foil Ball Challenge Crushed in a Hydraulic Press-What's Inside?

A Japanese aluminum foil ball is created and tested for density before being crushed in a hydraulic press. Initially, it measures 0.85 grams per milliliter, significantly less dense than solid aluminum. After crushing, the density increases to 1.9 grams per milliliter, showing it retains some air but is closer to solid aluminum.