Abstract:Recebido em 18/01/2016; aceito em 25/04/2016; publicado na web em 08/07/2016 BREATHING AND INSTRUCTING WITH AIR. A set of quasi-quantitative experiments are described to relate volume and pressure variations associated to the phase changes of the main components of the air. The processes are promoted by variation of temperature using liquid nitrogen to refrigerate the air and get liquid oxygen, traces of dry ice and ice. The changes in volume and pressure associated to oxygen phase changes are used to discuss … Show more
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