MATTER

KINETIC MOLECULAR THEORY OF MATTER: -

According to kinetic theory of matter:

·         Matter is made of very small particles called MOLECULES.

·         These molecules are in a state of motion.

·         They possess Kinetic Energy.

·         Molecular motion may be translational, rotational or vibrational.

·         These molecules attract each other.

·         As the temperature of a substance is increased, its molecular speed is also increased and vice versa.

·         If a substance is compressed, The K.E of its molecules increases and its temperature rises

BROWNIAN MOTION: -

A famous scientist ROBERT BROWN observed that molecules of a substance are moved in ZIG ZAG path. Their motion is random. They collide with each other and move in a new direction after collision in ZIG ZAG fashion. This type of motion present in the molecules of matter is called "Brownian motion".