Call them a bunch of intellectual lightweights.
Researchers at HRL Laboratories, the California Institute of Technology, and the University of California at Irvine have created what they say is the lowest-density material, a lattice of hollow tubes of the metal nickel.
Its volume is 99.99 percent air, and its density is 0.9 milligram per cubic centimeter--not including the air in or between its tubes. That density is less than one-thousandth that of water.
The metallic microlattice, as the researchers call it, could be useful for absorbing sound, vibration, and shock. Other possibilities, according to HRL: electrodes that could … Read more