GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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water
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silver
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wood
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rubber
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Detailed explanation-1: -Main role of an insulator is to keep electricity within the material and rubber is the best material because of that it’s used in the electric wire. Rubber is the best insulator that could be molded to shape and extruded.
Detailed explanation-2: -The best insulator in the world right now is most probably aerogel, with silica aerogels having thermal conductivities of less than 0.03 W/m*K in atmosphere. of aerogel preventing ice from melting on a hot plate at 80 degrees Celsius! Aerogel has its amazing properties because it’s mostly made out of air.
Detailed explanation-3: -Electricity passes through a material when there are free electrons present in them. Materials that don’t conduct electricity (with very few free electrons or even no free electrons) are called insulators. Rubber is an insulator as electrons are tightly held so that no electrons are free to move.
Detailed explanation-4: -Silicone foam/sponge are great thermal insulators for a few reasons: They are blown materials, so the cells hold off transfer of heat well. They have high heat resistance. Many silicone foam rubbers are capable of going above 350°F.