Brownian Motion Under a Microscope

Particles jitter randomly even when liquid seems still. Ask students to predict what will happen. Observe tiny particles at high magnification. Key idea: Collisions with unseen water molecules constantly jostle particles. Ask: What is hitting the particles if we can't see it? Safety and cleanup: Prepared slide; keep liquids off microscope electronics. https://www.youtube.com/watch?v=4GkuYWdH8r4