Meteorological observations and essays
Dalton's first book contained the first statement of "Dalton's Law of pressures." The foundation of the work was his poineering daily record of temperature, pressure, wind, humidity and rainfall over a five year period. He established the physics of the water-vapour content of the air, denying a chemical theory of the attraction of water for air and flouting the othodox and Newtonian view. his experiments showed that the water vapour content of air was not dependent on pressure, and that it exists in the atmosphere in an independent state.