![]() ![]() Democritus did not carry out any experiments to see ifhis theory was correct, he based his theory on his observations. In 400 B.C., theGreek philosopher Democritus proposed that all matter was made of tiny indivisible particles,which he named atomos. (School District of Philadelphia uses a textbook:Introduction to Matter, Holt, Rinehart, and Winston, p.80-87) We know something scientifically if we can pointto experimental evidence that proves it. The fundamental principle of modern science is the ideas that wegain knowledge from evidence. Inquiry Activity: Studentswill trace the changes that have occurred in atomic theory as scientists havediscovered more about atomic structure. Tell students it is these types of observations that inspired early philosophers and scientists and continue to motivate scientist to investigate and explain things they discover in nature. ![]() Tell students that many ideas and theories in science change because what is thought to be true changes when new things are discovered.
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