An insulator is something to stop heat travelling from place to place.
Keeping it warm, and keeping it cold can help test the insulator.
Materials that can handle Warm objects are, e.g: a tin cup. A tin cup is hot because it can control the heat, and the material for the cup is metal.
Materials that can handle cold objects is, e.g: a glass cup, it is cold because using warm water can not control the heat proberly, and it can make it break. But using cold water it can control it.
The similar things between cold and hot are that they both cant control heat for different materials, or objects.
LI: to determine the insulative properties of materials.
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