What does an insulator do?
question 9 options:

an insulator slows heat transfer.

an insulator warms a substance.

an insulator cools a substance.

an insulator emits electromagnetic radiation.
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An insulator slows down the heat transfer

Explanation:

An insulator is a substance that does not conducts electrical current, in terms of heat it does not allows the heat to pass through the material and because of this the heat transfer slows down.

These materials can be used to protect the body parts while working on electrical appliances or thermal appliances. All the electrical appliances are covered by insulator.

Example: rubber, paper, air, glass et cetera.

the answer for sodium is 0.186

the answer for rubidium is 0.251