Why are gases good insulators under normal conditions?

The density of the gas is very low, which means that the molecules there move very quickly and chaotically. Carriers of current on opposite sides of charges (positive and negative) cancel each other out. In our usual conditions, gases are non-polar dielectrics. What does it mean? I will say this in an accessible language: gases do not have free charge carriers, therefore the property of current conductivity is absent for them.

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