Question

Describe a simple experiment to illustrate that molecules are not at rest, but they constantly move.

Answer 1

Experiment:
•Take a beaker. Fill it partly with water.
•Add some lycopodium powder in the beaker containing water. Stir the contents of the beaker with a glass rod.
•Take out a few drops of this suspension on a glass plate. Place it on a table and illuminate it with a table lamp.
•Observe the glass plate through a microscope.
•It is found that the fine particles of lycopodium powder move rapidly in a random manner and their path is zig zag.