Which material is considered the best insulator?

Rubber is considered the best insulator among the materials listed due to its high resistance to electrical conductivity. This property makes rubber an excellent choice for insulation in electrical applications, as it effectively prevents the flow of electricity. Rubber's molecular structure contributes to its ability to trap electrons, which limits the electrical current from passing through.

In practical uses, rubber is often utilized in various electrical components such as wire coatings, gloves, and gaskets, providing safety against electrical shocks. Its durability and flexibility also enhance its insulating properties, making it suitable for a range of environmental conditions. Other materials like wood, plastic, and glass have varying degrees of insulation capabilities, but rubber’s superior resistance to electrical flow solidifies its position as the best insulator in this context.