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On June 4 2011 the Puyehue-Cord\'{o}n Caulle volcanic system produced apyroclastic subplinian eruption reaching level 3 in the volcanic explosivityindex. The first stage of the eruption released sand and ashes that affectedsmall towns and cities in the surrounding areas, including San Carlos deBariloche, in Argentina, one of the largest cities in the North Patagonianandean region. By treating the eruption as a Fermi problem, we estimated thevolume and mass of sand ejected as well as the energy and power released duringthe eruptive phase. We then put the results in context by comparing theobtained values with everyday quantities, like the load of a cargo truck or theelectric power produced in Argentina. These calculations have been done as apedagogic exercise, and after evaluation of the hypothesis was done in theclassroom, the calculations have been performed by the students. These arestudents of the first physics course at the Physics and Chemistry TeacherPrograms of the Universidad Nacional de R\'{\i}o Negro.

Fermi Problem: Power developed at the eruption of the Puyehue-Cord\'on Caulle volcanic system in June 2011