FM 96-13 Author: Giovanni Gallavotti Title: New methods in nonequilibrium gases and fluids Dedicated to the memory of Giovanni Paladin Abstract: Kinematical and dynamical properties of chaotic systems are reviewed and a few applications are described Keywords: Chaotic hypothesis, Onsager reciprocity, Nonequilibrium thermodynamics, Dynamical systems Fisica, Universita' di Roma La Sapienza, P.le Moro 2, 00185, Roma, Italia. e-mail giovanni@ipparco.roma1.infn.it tel. 6-49914370, fax 6-4957697 Home page: http://www.math.rutgers.edu/~giovanni