<http://schema.org/description>
"One of the least understood yet most important concepts is viscous dissipation, which is the shearing or stretching of the polymer between the rotating screw and stationary barrel, causing heat to develop in the material."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.ptonline.com/columns/where-does-shear-heating-occur-heres-how-to-find-out>