To help explain the differences between solids, liquids and gases we need to look closely at what they are made of. Scientists have found that all materials are made of very, very tiny particles. These particles are so small that we can’t see them with our eyes or even a microscope.
We can explain why solids, liquids and gases are different from one another using ideas about particles:
- how near they are to each other – when particles are close together they attract each other. This affects the behaviour of solids, liquids and gases.
- the way that they move – when we heat a material, its particles move faster or more vigorously.
This course is divided into three main modules: Density and Pressure; Change of State; and Ideal Gas Molecules.
The first three modules each have an quiz which you can use to check your understanding of the module’s content. You need to achieve the pass mark in each of these quizzes in order to attempt the final course quiz. You can, however, try each of these quizzes as many times as you wish.
(NOTE: This is a GCSE level course and covers just about everything in all the various syllabuses. It is a useful course for anyone who needs some additional input, delivered in a different way and with plenty of questions to try!)