Name one property of liquids and gases which tells us that their molecules are moving constantly.

A bottle of perfume was opened in a room. The smell of its vapours spread in the entire room. Name the property of gases which is responsible for this behavior of perfume vapours.

If the fish is being fried in a neighbouring home, we can smell it sitting in our own home. Name the process which brings this smell to us.

Fill in the following blanks with suitable words:

(a) The best evidence that the particles of matter are constantly moving comes from the studies of………. and ……….

(b) The smell of perfume gradually spreads across a room due to ………….

(c) Solid, liquid and gas are the three………….. of matter.

(d) At room temperature, the forces of attraction between the particles of solid substances are………….. than those which exist in the gaseous state.

(e) The arrangement of particles is less ordered in the…………. State. However, there is no order in the………State.

State two characteristics of matter demonstrated by:

(a) Diffusion.

(b) Brownian motion.