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Abel age 7, St Richards School QU: How is cornflour a solid & a liquid?

9/16/2016

 
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Hi Abel – great question. We showed you the non-Newtonian substance made of custard and powder and water in the Wizard Science Show we did in your brilliant school – so great you want to know more!

A solid as we discussed is made up of molecules that are tightly packed together. A liquid is made up of meolecules that are further apart and can move around more easily and take the shape of what they are in.
The molecules in cornflour (or custard powder that is made of cornflour) can move very close together when they are squashed and act like a solid. When you let go, the molecules move apart and start acting like a liquid which is why the substance can then fall through your fingers. So it is really both a solid and a liquid at the same time! If you fill a whole swimming pool (or even a paddling pool) with cornflour and water you can then walk across the top of it – the pressure of your feet pushing down keeps it solid under your feet. However if you stop walking, the molecules move apart and you sink (like quick sand!). There is a fantastic youtube video showing this, where Richard Hammond from Brainiac walks on custard. Check it out below!

Thanks for your brilliant question, stay curious and see you soon!!
​
- Lydia from Blast Science

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    Lydia Samuel  
    As Director
     of Blast Science and a Primary Science Teacher for more than 15 years, Lydia has answered unending questions about Science from hundreds of children for over a decade and has a wealth of Primary Science classroom experience. She has a particular passion for Wizard Science, Chocolate Science and all things Gross!
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    Tom Holloway
    ​is a Primary Science Teacher and Space Enthusiast. Alongside being a full time teacher he runs Star Gazing evenings, is a Science Advisor, has established a Darwin Garden in his school in Caterham and won Primary Science Teacher of the Year in 2013/14. Watch the video here!
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    I am 26 and have a degree and PhD in biochemistry. I enjoy learning new things and have spent 7 years at university studying and experimenting with molecules and microorganisms. I mainly like to play with bacteria and get them to do new things and produce different chemicals.  I also enjoy helping with Science projects in schools and enthusing children about my subject.
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