JOE:'Today's Dengineer is nine-year-old Kiran from Coventry.'
KIRAN:I need the Dengineers help to make a witchcraft and wizardry den for me to let my imagination go wild.
SEGE:I'm planning on this sort of spooky, rickety old witch's, wizard's house. Maybe a crooked and rickety roof as well to go with it.
KIRAN:Very interesting.
JOE:Yeah?
SEGE:Maybe somewhere to make your spells? How about that?
KIRAN:Yeah.
SEGE:With a cauldron maybe?
KIRAN:Yeah.
JOE:Kiran are you up for all that? Does that sound good mate?
KIRAN:Yeah.
JOE:Kiran's happy, that means we're happy.
SEGE:Fantastic. Means I'm happy.
LAUREN:'Sege has designed a space that would fit right into a fantasy world. 'The outside of the den will be built to look like a rickety old house, 'perfect for the finest witch or wizard. 'Inside there'll be an area for mixing potions, 'a space to write spells 'and a mysterious hocus pocus floor, that only Sege could conjure up.'
JOE:Sege, the den's looking great. It's brilliant I just wondered what else you've got in store for the inside.
SEGE:Well Joe, we've got loads of stuff in store for the inside and we're even going to get potions in there as well.
JOE:Like that one?
SEGE:Yeah like that. We're using something that's very very useful in the construction industry.
JOE:Right.
SEGE:It's called dry ice.
JOE:Dry ice?
SEGE:Watch this. I'm going to show you something. Look at what happens when you put it in there. Look at the atmosphere that gives off hey?
JOE:Amazing.
SEGE:Hey hows that for a bit of smoke? Dry ice isn't like the normal ice you put into drinks you know? This is a solid form of carbon dioxide and it has a surface temperature of minus 78 degrees Celsius.
JOE:Minus 78, that's chilly!
SEGE:How about that? Cold isn't it?
JOE:So how does it work?
SEGE:'Well you see Joe, normally when substances heat up they transform from a solid and then a liquid before turning into a gas. 'Think about a regular ice cube melting.
SEGE:'Goes from a solid, turning into water before evaporating 'but because dry ice is so cold 'it heats up really quickly when it comes into contact 'with other materials and misses out the liquid state in the middle 'and turns straight into gas and this is called sublimation.'
Presenters Lauren Layfield and Joe Tracini and The Dengineers team help Kiran from Coventry create a witchcraft and wizardry den.
The den will have an area for mixing potions, using dry ice to create a mysterious and smoky effect.
They demonstrate how dry ice works, as a solid form of carbon dioxide with a surface temperature of -78 degrees Celsius.
They explain that normally when heating an object, such as an ice cube, it will transform from a solid to liquid before turning into a gas.
But dry ice is so cold it heats up really quickly and misses out the liquid state in the middle turning straight into gas. This process in called sublimation.
Teachers Notes
This could be used to introduce the process of design, and as a prompt for class discussion and learning in areas such as initial research, designing and making a structure.
Pupils could investigate a variety of materials, checking to see if they turn from a solid to a liquid to a gas when heated up.
They could explore the idea of sublimation, why do some materials, like dry ice, go straight from a solid to a gas?
Curriculum Notes
This clip will be relevant for teaching Design and Technology at KS2 in England, Wales, and Northern Ireland and 1st and 2nd level in Scotland.
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