Answer
Brownian motion was observed using soot and dust particles suspended in water. They both jiggled and moved in the same way, leading him to believe there were collisions between visible particles and invisible atoms.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 11 - Reading Check Questions (Comprehension) - Page 223-224: 2
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