The Loss of the "Four Elements"

The disappearance of the traditional world of the ‘four elements’ was revolutionary. It was as radical in the world of chemistry as Copernicus’s proof that the earth was not the centre of the solar system; or (some said) as Robespierre’s claim that the people, not the king, embodied sovereignty. Moreover, it was counter-intuitive: it went against common sense and common appearances. Surely water and air were primary, simple elements? Not at all: chemical experiment and scientific inst...