Here's why:

* Gases: Gases are generally poor conductors of heat because their molecules are far apart and move freely. However, if the gas is ionized (meaning some of its atoms have lost or gained electrons), the free electrons and ions can carry heat energy by colliding with other molecules.

* Liquids: Liquids are better conductors of heat than gases because their molecules are closer together. Similar to gases, if the liquid is ionized, the free electrons and ions contribute significantly to heat transfer.

Key takeaway: The movement of free charged particles (electrons and ions) is essential for heat conduction in both gases and liquids.