Which statement best explains why gases are poor conductors of thermal energy?

Thermal Insulators

That's because air, like other gases, is a poor conductor of thermal energy. The particles of gases are relatively far apart, so they don't bump into each other or into other things as often as the more closely spaced particles of liquids or solids

Explanation:

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.