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18 March 2004 1544 GMT
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| Here's
an experiment you can try at home. This one is great fun and really
messy! Ask an adult to get you some custard. |
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The custard can go from being like a solid ball... |
What鈥檚 happening?
This happens because of what custard is made of.
Custard powder is really just cornflour, colour
and flavouring.
It was invented by Mr Bird after he found his wife
was allergic to eggs so she could not eat egg custard.
Cornflour is very finely ground flour. One of the
strange results of the fine grinding is that the particles made
will link together if you put a bit of pressure on them, but will
immediately separate when the pressure stops.
..to all stringy like this in seconds. |
As long as you keep squeezing, those links join
together and the custard stays in a ball.
In the same way, the pressure of the spoon handle
causes a clean cut to form in the custard, but as soon as it passes,
the custard becomes liquid again.
Go
back to the start 禄
听
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