dale lane

It’s still half-term, so time for another random “what can I do with the kids that’s vaguely science-y and only needs stuff that we have around the house”.

We made an evaporograph.

No, I’d never heard of it before, either.

But it was pretty cool which is why I’m blogging it myself instead of leaving Grace to write it up 😉

It worked like this…

We put water in a plastic cup, and put a sandwich bag over the top, wrapping rubber bands around it to keep it in place. Then we left it for a while (while we went to play ballon racing!) so the water would go to room temperature.

Then it was ready to go.

We briefly pressed something cold against the bag plastic. It made the water vapour in the inside of the cup condense, and collect on the underside of the plastic – leaving an imprint of whatever we pressed.

We got the best results with cold coins (coins we’d left in the freezer for a bit).

It looked seriously impressive, but my camera sucks at macrophotography (or I do?) and struggled to focus on transparent plastic, so you’ll have to take my word for it. The photos really don’t do justice to the imprints we made!

Big thanks to Spark, Bang, Buzz where I got the idea for this from.

This entry was posted on Friday, February 17th, 2012 at 9:11 pm and is filed under kids, misc. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.