With the concept of tension, Pierre Bourdieu gives the key tool to distinguish between the field of science and the field in which we fight for the legitimacy of science (within the world of science). Likewise, his concept of pressure is key in order to understand the relationship between society and science, the struggle for the legitimacy of science in the social world (three authors have developed such topics: Gaston Bachelard, the first, of epistemological order; Bourdieu himself, the second, of sociological order; And Jean-François Lyotard, the third, of a political order). However, Bourdieu oscillates between differentiating and mixing, both the tensions of each of the fields mentioned, as the opposition between tension and pressure. ...