Question

Brownian motion is observed when looking at smoke particles in a microscope.What causes the smoke particles to move at random?

Answer 1

Step-by-step explanation:

Brownian motion is evidence that air molecules move in random directions, with random speeds (and hence kinetic energy). When these air molecules knock into the smoke particles, they cause the smoke particles to move in random motions.

Why can't we see the air molecules themselves? That's because the air molecules are invisible, even with microscopes