What is superheated steam?

Superheated steam is steam that has been heated to a temperature higher than its boiling point while maintaining the same pressure. This state of steam is achieved by applying additional heat after the steam has already formed, meaning it exists above the saturation temperature for that pressure. As a result, superheated steam possesses higher thermal energy, which allows it to transfer more energy during heat exchange processes, making it particularly useful in various industrial applications, such as turbines or heating systems.

In contrast, steam at atmospheric pressure represents saturated steam, which is the point where steam exists in equilibrium with water and has not been heated further. Steam that has reached its boiling point indicates that it is at the saturation temperature and is not superheated. Lastly, steam that has lost all its heat content implies it is in a condensed state, which does not describe superheated steam at all. Thus, the definition provided in the correct choice accurately captures the essence and characteristics of superheated steam.