What do you mean by good and bad conductors? Give some examples of each. State coefficient of thermal expansion of a solid. What is its SI unit?
Good conductors are materials that allow heat or electricity to flow through them easily. Examples of good conductors include metals such as copper, aluminium, gold, and silver.
Bad conductors, also known as insulators, are materials that do not allow heat or electricity to flow through them easily. Examples of bad conductors include rubber, wood, plastic, and air.
The coefficient of thermal expansion is defined as the fractional increase in length or volume per unit rise in temperature.
The SI unit of the coefficient of thermal expansion is 1/K.