The liquid argon technology for neutrino and astroparticle detectors

Liquid argon detectors are being proposed for future neutrino and astroparticle experiments. I briefly discuss the LAr TPC technology and its first large scale application in the ICARUS 300 ton detector which was successfully run at surface. A different application is illustrated with the WARP project for WIMP dark matter searches, based on the development of a double phase technique. I conclude this brief review presenting the current ideas on the possible extrapolation of the LAr technology to a giant liquid argon detector to search for rare physics phenomena like neutrino interactions and proton decay.