Giant Thermomechanical Effect in Normal Liquid He-3

Measurements are presented of the thermomechanical coefficient of normal liquid He-3 confined in a porous plug pre-plated with four monoloyers of He-4. These non-magnetic monolayers displace the magnetic solid-like He-3 monolayers that are adjacent to the pore surfaces when the plug is filled with pure He-3. In the low temperature limit (T < 10 mK) the coefficient can be described by dP/dT ~ s/6v, where dP is the pressure difference across the plug generated by the temperature difference dT and s and v are the molar entropy and volume. This low temperature limit corresponds to the condition d