We were trying to test different materials for their insulation properties. Ice cubes were put inside plastic bottles and then the bottles were wrapped in different materials. A material which is a good thermal insulator will slow down the melting of an ice cube by reducing the amount of heat in the room getting through. Here are some pictures to show you what we did. We made sure it was a fair test by changing only the material and keeping all the other variables the same. We will discuss our results and post our findings in a few days ...

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Update: Different groups found different results. The bubble wrap and corrugated card did well in most groups. After discussion, some children decided the air trapped in the bubbles and in the folds of the corrugations was the most likely reason the outside heat couldn't get easily to the ice cube inside the bottles.