Material that sends sound from water to air could help eavesdroppers

A cloth that may transport underwater sounds into the air, permitting them to be heard clearly above the water’s floor, may very well be used for monitoring aquatic environments or eavesdropping on underwater communications.

Sound usually can’t journey between water and air due to a mismatch in densities between the 2 mediums. It as an alternative displays on the boundary.

Now, Bin Liang at Nanjing University in China and his colleagues have developed a cloth that enables virtually the entire sound to cross …