Absorbing Hydrogen Turns Palladium Into A Quasi Liquid� - Technology Review: Kawasaki and co attached a rectangular plate of palladium about the size of of stick of gum to the side of a chamber so that it stuck out horizontally. They then heated it to 150 degrees C and hung the weight of an apple on the end of plate. Finally, they pumped hydrogen into the chamber and waited while the metal absorbed it.
To their surprise, the palladium immediately drooped under the weight and continued to droop as the hydrogen was pumped out of the chamber and the gas was desorbed. (In contrast, when they hung the plate vertically with the weight hanging beneath, there was almost no stretching at all.)