BRW Science Challenge Two

Remember I said to start making some ice-cubes? Well here’s why!

Gather as many as you can and see if you can make the tallest skyscraper before they all melt.

WARNING: Use gloves and set yourself a time limit. You don’t want ice burns.

Nice Ice Cube Tower Stock Photo - Download Image Now - iStock

HERE’S THE SCIENCE BIT: Water can exist in three states: solid (ice), liquid (water) and gas (steam). By changing the state of water (i.e. applying or removing heat) you change its properties. Imagine trying to construct a tower out of liquid water or steam!
As you are building your towers you will notice the ice beginning to melt. The ice melts as it absorbs energy from the surrounding environment.

TAKE IT FURTHER: How would different sized or shaped blocks of ice change this investigation?

TOP TIP: Salt lowers the freezing point of water. As it dissolves, the ice melts around each grain of salt. As a result, the ice is unevenly eaten away, forming a pitted, non-skid surface. This is why salt is used to melt ice on roads and walkways.

The salty water also re-freezes on the surface of the ice cubes, joining them together. This happens because the insides of the ice cubes are much colder than the freezing point of water. They are cold enough to draw heat out of the newly melted water and it re-freezes.

This Challenge is open to every class so have a go and send your photos to Mrs Byrne and I’ll add them to this blog to share. Include your name and class so I know who to give the credit to.

Here’s our first one…

Wow Alex. that’s amazing! I hope your hands didn’t get too cold. Great work. Can anyone beat this I wonder…..


  1. I would love to do that I have now got some orange and plain ice cubes in the freezer, Also do ice cubes with frozen fruit in count?

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