Corning Reveals Gorilla Glass 4, Promises No More Broken IPhones
An anonymous reader writes "Corning introduced next-generation Gorilla Glass, which it said is ten times tougher than any competitive cover glass now in the market. The company says that the Gorilla Glass 4 so launched is to address the No.1 problem among the smartphones users- screen breakage due to everyday drops."
Toughness is a perfectly good engineering term with a defined meaning. Look it up. Wikipedia is a decent start. "In materials science and metallurgy, toughness is the ability of a material to absorb energy and plastically deform without fracturing."
It's typically measured by an impact test.