Brownian Motion Under a Microscope
Particles jitter randomly even when liquid seems still.
Teaching & key ideas
What you do: Observe tiny particles at high magnification.
What students see: Particles jitter randomly even when liquid seems still.
Why it works: Collisions with unseen water molecules constantly jostle particles.
Question to ask: What is hitting the particles if we can't see it?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: What is hitting the particles if we can't see it?