Democritus built up his thoughts regarding atoms through intellectual idea, while Dalton built up his thoughts by performing experiments and making careful estimations. Since Democritus utilized just idea and not controlled experiments, he had no detectable certainties to help his thoughts and no methods for testing his theories.
Democritus and Dalton both proposed the concept of atoms. Democritus developed his ideas about atoms through intellectual thought, whereas Dalton developed his ideas by performing experiments and making careful measurements. Because Democritus used only thought and not controlled experiments, he had no observable facts to support his ideas and no means of testing his theories.
