Usually air is an excellent insulator, until a voltage spike of sufficient magnitude comes along [e.g. lightning] and makes "it's own path"; this phenomena is called "di-electric breakdown".
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Air is an insulator. It does not conduct electricity well because it is made up of molecules that are widely spaced and do not easily transfer electrons.
Air is typically considered to be a good insulator, meaning it does not conduct electricity well. However, if the air contains impurities or moisture, it can become a conductor, allowing electricity to flow through it.
Cork is an insulator. It has low thermal and electrical conductivity due to its cellular structure which traps air and reduces the transfer of heat or electricity.
Wind is neither a conductor nor an insulator. It is simply moving air. Wind does not have the ability to conduct or insulate electricity like materials such as metals or rubber.
Moist air is a very poor conductor of electricity. However, the presence of moisture can slightly increase the conductivity of air compared to dry air due to the dissolved ions in water. Overall, though, moist air is still considered to be a good insulator.
Air is generally considered to be an insulator because it does not conduct electricity well under normal conditions. However, in certain cases where air becomes ionized or has a high concentration of charged particles, it can act as a conductor and allow electricity to flow through it.