How does heat change materials? Includes footage of a glass blower working with glass. Glass starts as sand, and when it is heated to a high temperature it melts to form liquid glass. When it is hot it can be formed into different shapes then cooled to become solid again.

First broadcast:
1 October 2007

The first part of this clip could be played during a lesson on everyday objects and their uses, to initiate thoughts on the materials they are actually made from. It could be viewed to provoke thoughts about how some of the solid objects they have encountered can, when made from certain materials, be changed by squashing, bending, twisting and turning. The clip could encourage the pupils to suggest where they have seen unusual and creative uses of some common, everyday materials.