Science KS1 / KS2: How batch is heated to make glass
Guinea Pig is at a glass factory to see how glass is blown.
He reveals how the sand-like material called batch is heated up to 1350 degrees Celsius in a furnace.
Once melted, the new material can be blown and shaped into whatever shape is required, before being left to cool and harden.
This shows how materials can change state from solids to liquids and then back to solids again, all through the process of heating and cooling.
This short film is from the BBC series, Ultimate Brain: Mad Lab.
This could be an excellent introduction to learning all about reversible and irreversible changes.
Pupils could use what they learn in this short film to predict what might happen in other experiments where materials are heated or cooled.
In these experiments they could suggest whether they think the change will be reversible or irreversible.
Melting chocolate, cooking bread to make toast and boiling or freezing water are all ways of investigating whether or not changes in state can be reversible.
This could also be an introduction to research into the temperature at which different materials change state.
These short films are suitable for teaching science at Key Stage 1 and 2 in England, Wales and Northern Ireland, and First and Second Level in Scotland.