Insulation
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Insulation is that material that is in nearly every house and building that keeps the inside temperature the same wither that would be keeping the cold air in and the hot air out in the summer or keeping the hot in and the cold out in the winter. Insulation has many properties that makes the material that it is made out of good at separating two two different temperatures.
Conclusion
The computer case and paper was a terrible insulation shown by how fast the temperature inside dropped as it was transferred through the case. A good insulation would have kept the temperatures the same with little to no change.