(a) Matter can be defined as anything that occupies space and has a volume. It possesses mass.

Examples - Air, Water, Soil and plastic.

(b) Characterstics of Particles of Matter

(i) Particles in matter are in a state of continuous motion-

The particles present in matter are not stationary, but have a tendency to acquire motion. In fact they are in a state of continuous motion.

(ii) Particles in matter attract one another-

The particles in matter attract one another. This attraction is inversely proportional to the distance between the particles.

(iii) Particles in matter have spaces between them -

Empty spaces called voids separate the particles from one another. Due to these voids matter is able to disperse into one another bringing about diffusion.