What evidence did dalton have that atoms actually exist?

Dalton noted that the chromium oxide molecules that he was studying had masses of oxygen that were not the same: he found that there were constant ratios to these mass differences, however, so there had to be some sort of "units" (atoms) making up the ratios of these particles.

False, as a substance changes from a solid to a liquid and from a liquid to a gas the molecules get farther apart from each other