The Secrets Of Sandpaper
A Moment of Science - Podcast készítő Indiana Public Media
Sandpaper isn't made of ordinary sand, it's made of abrasive minerals like aluminum oxide or garnet that are glued onto a paper backing.
A Moment of Science - Podcast készítő Indiana Public Media
Sandpaper isn't made of ordinary sand, it's made of abrasive minerals like aluminum oxide or garnet that are glued onto a paper backing.