________ are tiny particles which constitute matter.
When a beam of sunlight enters a room throuth a window, we can see tiny particles X suspended in a gas (or rather a mixture of gases )Y which are moving rapidly in a very haphazard manner.
(a) What could particles X be ?
(b) Name the gas (or mixture of gases) Y.
(c) What is the phenomenon exhibited by particles X known as ?
(d) What is causing the movement of particles X ?
(e) What conclusion doed the existence of this phenomenon give us about the nature of matter ?
Name a colloid in which tiny solid particles are dispersed in a liquid medium. Give an example.