The theory of heating the is an old theory of the Chaleur. For Lavoisier heat is matter and even a element, a substance, a Fluide imponderable and indestructible that it calls fluid igneous .

We know, in general, that all the bodies of nature are plunged in the heating one, that they are surrounded by it, penetrated of all shares, and that it fills all the intervals which between them their molecules leave; that in certain case heating fixes in body, of manner even to constitute their parts solid, but that generally it from of draws aside molecules, it exerts on them repelling power, and that it is of its action or its more or less large accumulation that depends the passage on the trade solid in the liquid state, of the liquid state in a gaseous state|Antoine Laurent de Lavoisier

This theory which will perdura until Sadi Carnot constitutes a first level of reflection in the field of the Thermodynamique.

External bond

• Of heating with entropic the