Question

what causes the air above a pot of boiling water to become warm?
the air transfers thermal energy to the water vapor.
the water vapor transfers thermal energy to the air.
the particles in the air lose kinetic energy.
the particles in the water vapor gain kinetic energy.

Explanation:

When water boils, it turns into high-temperature water vapor. Thermal energy flows from a warmer substance to a cooler one. The warm water vapor transfers its thermal energy to the cooler surrounding air, which warms the air. The other options are incorrect: air does not transfer energy to warmer water vapor; air particles gaining (not losing) kinetic energy would warm the air; water vapor particles already have high kinetic energy from boiling, and it's the transfer of this energy that warms the air.

Answer:

The water vapor transfers thermal energy to the air.