Brownian motion

The video explains Brownian motion, a phenomenon observed in liquids and gases under a microscope. It uses the example of smoke particles in air, which move due to collisions with air molecules. This motion provides evidence for the existence of atoms and molecules, which are too small to be seen even with a microscope. Additionally, the video shows how tiny mineral crystals inside microscopic algae are moved by invisible water molecules.

What is Brownian motion primarily observed in?

• Solids

• Liquids and gases

• Vacuum

• Plasma

What causes the movement of smoke particles in the air?

• Wind currents

• Temperature changes

• Collisions with air molecules

• Magnetic fields

Why can't we see the atoms and molecules causing Brownian motion?

• They are hidden by other particles

• They move too fast

• They are transparent

• They are too small to be seen even with a microscope

What does Brownian motion demonstrate about atoms and molecules?

• Their weight

• Their color

• Their charge

• Their existence

In the example given, what is moving the mineral crystals inside algae?

• Sound waves

• Light waves

• Water molecules

• Air molecules