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Dizzydolly · Top of the class Joined: 29 Nov 2005 Posts: 477

We r avin a science week next week and the school challenge will be to keep a giant ice cube frozen for the longest time. Any ideas

Tiki · Posted: Tue May 13, 2008 4:01 pm Post subject:

How giant is giant?

Get dry ice and place it with the ice cube in a container.

One of the traditional methods for preserving ice was to pack it in sawdust. You could try wrapping the cube in bubble wrap which should act as an insulator.

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Lucybelle · Posted: Tue May 13, 2008 4:02 pm Post subject:

leave it in the freezer Wink

put it in a bucket and put the bucket in a sink full of cold water.

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Dizzydolly · Top of the class Joined: 29 Nov 2005 Posts: 477

the ice cube will be the size an shape of a balloon. don't think dry ice is an option

Tiki · Posted: Tue May 13, 2008 4:14 pm Post subject:

If you make the icecube yourself boil the water, that with get all the air bubbles out of it.

make sure that anything you use to insulate the cube with is cold.

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Accept that some days you are the pigeon and some days the statue

Dizzydolly · Top of the class Joined: 29 Nov 2005 Posts: 477

can't make it myself. Deputy head is making them all

Rosie · Top poster Joined: 10 Nov 2006 Posts: 1288

Pack it in straw (good insulator)- that's what they used in "Ice Houses" in the past

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dancingqueen · Moderator Joined: 30 Oct 2005 Posts: 45317

have you searched on the net...lots of ideas maybe you could have different groups trying different ways

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dadenuk · Moderator Joined: 08 Dec 2005 Posts: 9132

Build a metal box (yes I know, good conductor... but wait 2 secs)... insert ice cube, surround with water. Seal box. Attach two or three low voltage TECs (cold side to the box)... should work a treat Smile

In case you're wondering about a TEC... one for a computer here...

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dadenuk · Moderator Joined: 08 Dec 2005 Posts: 9132

Build yourself some sort of phase change (condensation / evaporation) cooler along the lines of a domestic fridge.

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A wise person avoids it.

Lucybelle · Posted: Tue May 13, 2008 6:11 pm Post subject:

I've just remembered that when i did this in a year 4 class. i think silver foil kept the ice cube pretty solid. it kept the cold air in and the hot air out.

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Lucybelle

Dizzydolly · Top of the class Joined: 29 Nov 2005 Posts: 477

Tin foil sounds easy mite try that 1

dancingqueen · Moderator Joined: 30 Oct 2005 Posts: 45317

does it have to be easy...or the longest lasting?

_________________

Climbing, forever trying - find your way out of the wild, wild wood
Now theres no justice - only yourself that you can trust in

Dizzydolly · Top of the class Joined: 29 Nov 2005 Posts: 477

longest lasting ice cube wins

DOROTHY · Forum Supporter Joined: 26 Aug 2006 Posts: 4176

No suggestions but good luck.

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