1. This material is one of the lightest solids known, since more than 99% of its composition by volume is air. Making it ...

We will look at a very easy experiment that provides lots of information about the strength or the mechanical behavior of a material, called the tensile test. The basic idea of a tensile test is to ...

If you struggled with the quiz, don't panic - we've got you! You can revise density of materials by clicking the links below. Click the links below to try our GCSE physics exam-style or quick-fire ...

Test yourself in our quiz. The second series of His Dark Materials begins on BBC One on Sunday 8 November at 8.10pm. Find out more about the series here. Quiz: Can you guess the animal from its ...