Solid snow and ice melt into liquid water. Sand melts - but what does it become? Metals melt - but how can you tell which object is made out of which metal? And when solids get mixed up in liquids, how can you separate them?

Also available in Streaming on Learn360.

This episode covers the following segments: 8.1 Opening montage 8.2 Glass blowing 8.3 Melting snow 8.4 Melting metals 8.5 Molten rock 8.6 Sieving and filtering 8.7 Thames dredger.