Explain what is random motion of particals

Also known as Brownian motion

Explanation:

If you take a gas particle and drop it in a container,  you will observe under a microscope the particle will be moving in a random pattern. Eventually it will collide with another particle. They are free to move. Each particle has it's own kinetic energy.

They can be described as small, discreet and meaning all the particles are separate. They will not stick together.

The path these particles take is random.

Example: Dust particles move randomly. The reason why the dust particles more randomly is because of the air or gas between them. You can observe dust particles in the air when you are looking in the sun light but you don't see the air molecules. It appears the dust is doing the moving but it's the gas in between them that is moving them.

Another example is : Pollen in water also moves randomly in water. Each water molecule is too small to see, but you can see the pollen moving because it is bigger. This is the Brownian motion.