Air is not a good conductor of heat because its molecules are not in continuous or close contact with one another.
What is a Conductor?
This is referred to as an object or type of material that allows the flow of charge in one or more directions and examples include metals such as iron, copper etc.
Air on the other hand have molecules which are not in close contact with one another unlike a solid thereby making conduction to be less effective. This is also because its molecules' vibrations does not immediately affect their neighbors thereby making it the correct choice.
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