The proposal of this work is to analyze and to intervene in an exposition of Thermodynamics of the Estação Ciência. We appeal to the inquiry of the language of the monitors of the Estação Ciência in the explanation of the experiments to help in the perfectioning of the exposition. We use and analyze some instruments of evaluation of the process teaching learning in Museums and Science Centers based on Vygotsky and statistical calculations. The results of this research lead to the consideration of three basic aspects: - The importance of the monitors in a scientific exposition and its continuous training; - The necessity of improvement of the exposition in an evaluation process that lead to better result of learning; - Student visits to Museums and Science Centers are a very important factor to forster the interest of pupils for the expositions and make the learning more significant in these environments
