Demonstre em aula: gotas que inflamam uma abordagem construtivista

This paper suggests a very simple set-up that allows an amazing demonstration in Physics high-school classes: the phenomena of liquid oxygen condensation on a surface refrigerated with liquid nitrogen. The demonstration involves an unusual effect and its purpose is to serve as an inducing element for constructivist learning allowing the students to analyze it, discuss it, formulate hypothesis and finally to achieve a correct explanation for the observed phenomena.