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Question Collapsing can

5 months 2 weeks ago #41647 by AndyG
I've found a couple of references to the Collapsing Can using a drinks can inverted into water on the CLEAPSS website. One reference says 'demo', the second 'experiment' (when relating bad experimental method to an accident).

I've always done it as a demo but someone has apparently been collecting cans ... What is the feeling about this being a class practical rather than a demo?

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5 months 2 weeks ago #41648 by SteveKeys
Always a demo here, but often done twice as it's one of those "Do it AGAIN!!!" demos!

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5 months 2 weeks ago - 5 months 2 weeks ago #41649 by TecHKnow

Please consider buying me a drink for Christmas by making a donation to the website - Happy Christmas and Thank you!

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5 months 2 weeks ago #41650 by AndyG
Yes.

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5 months 2 weeks ago #41651 by woody
Depending on the class and of course the cans available we try to do this as a class activity, beaker tongs are a good way of holding the can after heating to immerse the open end in the trough of water, the only problems we have had is when they heat the can for too long or put too much water in.
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5 months 2 weeks ago #41652 by prep_room_boy
Always done it as a demo since they banned fizzy drinks in school.

Teachers always wanted it first lesson ( with no notice) and one day the caretaker came up behind me as I was rooting about in the bins for empty cans.

He offered me a Tupperware box and said, "You can have one of my sandwiches if you are that desperate".

Since I saw this we never bought the expensive cans from the suppliers.

I miss the good old days of imploding a metal gallon can that used to hold oil such as Castrol GSX. They are probably collectors pieces now.

Another good example of this is to use an empty bubble bath bottle. Plunge it into hot water then screw the cap on and leave on the side of the bath. The kids can do this one as homework.
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5 months 2 weeks ago #41655 by Kasey

woody wrote: Depending on the class and of course the cans available we try to do this as a class activity, beaker tongs are a good way of holding the can after heating to immerse the open end in the trough of water, the only problems we have had is when they heat the can for too long or put too much water in.


Same here. if the teacher trusts the class, then it's a practical, otherwise a demo. Teacher really has to know the class very well....

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