This book describes the experiment I completed to investigate which materials are better insulators.

Science Experiment 

Next we got hot water. we used the thermometer to test the starting temperature. It was 58 degrees

We kept taking the temperature of both cups.<br/>Our prediction was right, the tinfoil did keep the water warmer!

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We predicted that the tinfoil would keep the water hotter than the bubble wrap because when lifeguards save people, sometimes use tinfoil to keep them warm.

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We covered both cups with cotton wool. Then we put tinfoil on one cup and bubble wrap on the other