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The present work deals with some of the students’ difficulties at a Physics teaching laboratory. Using experiment reports written by students in a laboratory course at the Physics Institute of USP we analyzed the understanding of typical concepts in a physics experiment like measurement, uncertainty, fluctuations etc. A qualitative analysis of the reports content shows that measurements are very often represented incorrectly and when they are correct, the interpretation is wrong; the observer and measurement instrument influences surpass and conceal the intrinsic properties of a physical measurement. For interpretation of the results we used reality concepts that have been presented by authors in the area of Sociology; we based on the assumption that students’ everyday life reality is different from the reality as seen from a scientific perspective. We tried to connect the difficulties found by students when they have to measure, express and analyze results of a laboratory measurement, to their everyday life conceptions. We consider that the difficulties found by students’ in their Physics teaching laboratory have a strong component of a misleading conception, of common sense, in relation to certain aspects of the scientific field, rather than an ignorance of statistical procedures that are used in the elaboration of results.

Uma interpretação para as dificuldades enfrentadas pelos estudantes num laboratório didático de física